The Hacker Chronicles - A…the Computer Underground/The Hacker Chronicles - A Tour of the Computer Underground (P-80 Systems).iso/misc/glossary.txt

Text File | 1992-11-22 | 121KB | 3,357 lines

2D    2-Dimensional
3D    3-Dimensional
3M    Minnesota Mining and Manufacturing
4GL    Fourth Generation Language
4H    Head, Heart, Hands, Health
4WD    Four wheel Drive (see also FWD)
A    Aftermath
AA    Affirmative Action committee
AA    Alcoholics Anonymous
AA    Antiaircraft Artillery
AA    Associate in Accounting
A&A    Astronomy and Astrophysics [Space]
AA    Automobile Association [England]
AAA    American Automobile Association
AAAL    American Academy of Arts and Letters
AAAS    American Association for the Advancement of Science
AAII    American Association of Individual Investors
AAMSI    American Association for Medical Systems Informatics
AAO    Anglo-Australian Observatory [Space]
AAP    Affirmative Action Program
AARC    Anglo-American Cataloging Rules
AARN    Australian Academic Research Network [Networking]
AARP    American Association of Retired Persons
AAS    American Astronomical Society [Space]
AAVSO    American Association of Variable Star Observers [Space]
AB    ABle seaman
ABA    American Bar Association
ABA    American Basketball Association
ABA    American Booksellers Association
ABBR    ABBReviation
ABC    American Broadcasting Company [Corporate name]
AC    Alternating Current (ac, see also DC)
AC    Ante Christum (before Christ)
AC    Ante Cibum (before meals)
ACAA    Agricultural Conservation and Adjustment Administration
ACAWS    Advisory, Caution, And Warning System
ACBL    American Contract Bridge League
ACC    Argonne Code Center
ACCS    Army Command and Control System
ACD    Automatic Call Distributor [Telephony]
ACE    Advanced Composition Explorer [Space]
ACE    Advanced Computing Environments [Corporate name]
ACE    Automatic Calibration and Equalization
ACHEFT    Automated ClearingHouse Electronic Funds Transfer
ACK    ACKnowledge
ACL    Advanced Cmos Logic
ACLU    American Civil Liberties Union
ACM    Association for Computing Machinery
ACRV    Assured Crew Return Vehicle (or) Astronaut Crew Rescue Vehicle [Space]
ACS    Advanced Communications System
ACSE    Association Control Service Entity (ISO/CCITT layer 7)
ACT    Action for Children's Television (in Cambridge, MA)
ACT    American Conservatory Theater
ACTS    Advanced Communications Technology Satellite
ACTS    Automatic Coin Telephone Service [Telephony]
ACU    Alarm Control Unit
ACU    Automatic Call Unit [Telephony]
ACW    Alternating Continuous Waves
AD    After Date
A/D    Analog to Digital converter (see ADC)
AD    Anno Domini (in the year of our Lord)
AD    Application Development
Ad Astra    To the stars [Latin, Space]
ADAP    Alzheimer's disease-associated protein
ADAP    American Discount Auto Parts [Corporate name]
ADB    A DeBugger
ADB    Apple Desktop Bus
ADC    Analog to Digital Converter
ADCI    Automatic Display Call Indicator
AD&D    Advanced Dungeons & Dragons
ADF    Automatic Direction Finder
ADM    ADMiral
ADP    Adenosine Di-Phosphate
ADP    Administrative Data Processing
ADP    Advanced Data Processing
ADPCM    Pulse Code Modulation with Adaptive Quantization
ADS    Application Development System
ADSR    Attack Decay Sustain Release
ADT    Abstract Data Type
ADT    Atlantic Daylight Time
AE    Application Execution
AEA    American Electronics Association
AEC    Atomic Energy Commission
AEF    American Expeditionary Force (see BEF)
AEGIS    Advanced Electronic Guidance and Instrumentation System
AF    Adventures in Fantasy
AF    Air Force
AF    Audio Frequency
AFADS    Automatic Force Adjustment Data System
AFATDS    Advanced Field Artillery Tactical Data System
AFB    Air Force Base
AFC    American Football Conference
AFC    Automatic Flight Control
AFC    Automatic Frequency Control
AFCAC    Air Force Computer Acquisition Center
AFCC    Air Force Communications Command
AFGE    American Federation of Government Employees
AFIPS    American Federation of Information Processing Societies
AFL    American Federation of Labor
AFL    American Football League
AFLCIO    American Federation of Labor and Congress of Industrial Organizations
AFNOR    Association Francaise de NORmalization
AFP    Appletalk Filing Protocol
AFS    Andrew File System
AFSC    Air Force Systems Command
AFSCME    American Federation of State, County and Municipal Employees
AFTRA    American Federation of Television and Radio Artists
AG    Adjutant General
AG    Arcade Game
AG    Attorney General
AGCT    Army General Classification Test
AGN    Active Galactic Nucleus [Space]
AHL    American Hockey League
AHQ    Air HeadQuarters
AI    Artificial Intelligence
AIAA    American Institute of Aeronautics and Astronautics [Space]
AIC    Automatic Intercept Center
AID    Agency for International Development
AIDDE    Ames' Interactive Dynamic Display Editor
AIDS    Acquired ImmunoDeficiency Syndrome
AIOD    Automatic Identification Outward Dialing
AIS    Automatic Intercept System
AIX    Advanced Interactive eXecutive (IBM's name for UNIX)
AJ    Astronomical Journal [Space]
AK    Alaska
AKA    Also Known As
AL    Alabama [US state postal designation]
AL    American League (baseball)
ALA    American Library Association
ALA    Automobile Legal Association
ALBM    Air-to-Land Ballistic Missile
ALC    Automatic Load Control
ALGOL    ALGOrithmic Language
ALIT    Automatic Line Insulation Testing [Telephony]
ALPO    Association of Lunar and Planetary Observers [Space]
ALS    Advanced Launch System [Space]
ALU    Arithmetic Logic Unit
A&M    Agricultural and Mechanical
AM    Amplitude Modulation
AM    Ante Meridiem (before noon)
AMA    American Medical Association
AMA    Automatic Message Accounting [Telephony]
AMARC    Automatic Message Accounting Recording Center
AMBA    Association of Master of Business Administration
AMC    Albany Medical College
AMC    American Motors Corporation(?) [Corporate name]
AMC    Appalachian Mountain Club
AMD    Advanced Micro Devices [Corporate name]
AMEX    AMerican EXpress [Corporate name]
AMI    Alternate Mark Inversion (see also NRZ, NRZI, B8ZS)
AMORC    Ancient Mystic Order Rosae Crucis
AMP    Adenosine MonoPhosphate
AMPAS    Academy of Motion Picture Arts and Sciences
AMPAS    Acedemy of Motion Picture Arts and Sciences
AMRAAM    Advanced Medium Range Air-To-Air Missile
AMROC    American Rocket Company [Space]
AMSAT    radio AMateur SATellite corp.
AMU    Atomic Mass Unit
AMVET    AMerican VETeran
ANA    American Nurses Association
ANAC    Automatic Number Announcemnt Circuit [Telephony]
ANC    All Number Calling [Telephony]
ANC    Army Nurse Corps
ANDF    Architecture-Neural Distribution Format
ANF    Automatic Number Forwarding [Telephony]
ANG    Air National Guard
ANI    Automatic Number Identification (see also: CLID) [Telephony]
ANL    Argonne National Laboratory
ANOVA    ANalysis Of VAriance
ANPA    American Newspaper Publishers Association
ANSI    American National Standards Institute
ANZUS    Australia, New Zealand, United States
AO    Account Of
AOA    Abort Once Around [NASA, Shuttle]
AOA    Abort Once Around (Shuttle abort plan) [Space]
AOL    Absent Over Leave (see AWOL)
AOS    Academic Operating System
AOS    Alternate Operator Service [Telephony]
A/P    Accounts Payable
AP    Additional Premium
AP    All Points
AP    Associated Press [Corporate name]
APA    All Points Addressable
APA    American Psychological Association
APB    All Points Bulletin
APDA    Apple Programmers and Developers Association
API    Application Programming Interface
APICS    American Production and Inventory Control Society
Ap.J    Astrophysical Journal [Space]
APL    A Programming Language
APL    acute promyelocytic leukemia [Disease]
APO    Alpha Phi Omega, service fraternity
APO    Army Post Office
APP    Applications Portability Profile
APPC    Advanced Peer-to-Peer Communications
APR    Annual Percentage Rate (as in loan interest)
APSE    Ada Programming Support Environment
APU    Auxiliary Power Unit [Space]
AQ    Accumulator-Quotient register
A/R    Accounts Receivable
AR    Address Register
AR    Arkansas
ARC    AIDS-related complex
ARC    American Red Cross
ARC    Ames Research Center (NASA) [Space]
ARCNET    Attached Resource Computer local area NETwork
ARO    After Receipt of Order
ARP    Address Resolution Protocol
ARPA    Advanced Research Projects Agency (of the DoD, see DARPA)
ARPANET ARPA (q.v.) NETwork
ARRL    Amateur Radio Relay League
ARV    American Revised Version
AS    Anglo-Saxon
ASA    Acetyl Salicylic Acid
ASAP    As Soon As Possible
ASC    Accredited Standards Committee
ASCAP    American Society of Composers, Authors, and Publishers
ASCC    Automatic Sequence-Controlled Calculator
ASCII    American Standard Code for Information Interchange
ASDIC    Anti-Submarine Detection Investigation Committee (British for sonar)
ASDSP    Application-Specific Digital Signal Processor
ASG    Automated Sciences Group
ASHRAE    Amer. Soc. of Heating, Refrigerating and Air-cond. Engineers, inc.
ASIC    Application Specific Integrated Circuit
ASME    American Society of Mechanical Engineers
ASN    Abstract Syntax Notation One (ISO/CCITT ASN.1)
ASP    Aggregated Switch Procurement
ASRM    Advanced Solid Rocket Motor [Space]
ASSR    Autonomous Soviet Socialist Republic
AST    Atlantic Standard Time
ASV    American Standard Version
AT    Atlantic Time
ATA    Automatic Trouble Analysis
ATACC    Advanced Tactical Air Command Central
ATB    Advanced Technology Bomber (stealth bomber)
ATC    Air Traffic Control
ATDRS    Advanced Tracking and Data Relay Satellite [Space]
ATF    Advanced Technology Fighter
ATIS    Atherton Tools Interface Specification
ATLAS    Atmospheric Laboratory for Applications and Science [Space]
ATM    Amateur Telescope Maker [Space]
ATM    Asynchronous Transfer Mode
ATM    Automatic Teller Machine
ATO    Abort To Orbit [NASA, Shuttle]
ATO    Abort To Orbit (Shuttle abort plan) [Space]
ATOMS    AT&t Optimized Materials Simulator
ATP    Adenosine TriPhosphate
ATPCO    Airline Tariff Publishing COmpany
AT&T    American Telephone & Telegraph [Corporate name]
ATT    American Telephone & Telegraph (normally written AT&T when seperate)
ATTIS    American Telephone and Telegraph Information Systems [AT&T] (Division)
ATV    All Terrain Vehicle
AU    Astronomical Unit (93,000,000 miles) [Space]
AU    Astronomical Unit [Space]
AUI    Attachment Universal Interface
AURA    Association of Universities for Research in Astronomy [Space]
AUS    Army of the United States
AUTODIN AUTOmatic DIgital Network
AUTOVON AUTOmatic VOice Network
AV    AudioVisual
AVLIS    Atomic Vapor Laser Isotope Separation
AWACS    Airborne Warnings And Control Systems
AWEA    American Wind Energy Association
AWK    al Aho, peter Weinberger, brian Kernighan (pattern scanning language)
AWOL    Absent WithOut Leave (also Absent Without Official Leave) (see AOL)
AW&ST    Aviation Week and Space Technology (a.k.a. AvLeak) [Space]
AXAF    Advanced X-ray Astrophysics Facility [Space]
AZ    Arizona
B    Book
B8ZS    Binary 8 Zero Substitution (see also NRZ, NRZI, AMI)
BA    Bachelor of Arts
BACH    Business Alliance for Commerce in Hemp
BAFO    Best And Final Offer
BARRNet Bay Area Regional Research Network (SF Bay Area)
BASIC    Beginner's All-purpose Symbolic Instruction Code
BATSE    Burst And Transient Source Experiment (on GRO) [Space]
BB    Bases on Balls
BB    Best of Breed
BB    Bunnies and Burrows
BBA    Bachelor of Business Administration
BBB    Better Business Bureau
BBC    British Broadcasting Corporation
BBL    Barrel
BBN    Bolt, Beranek, and Newman, Inc. [Corporate name]
BBXRT    Broad-Band X-Ray Telescope (ASTRO package) [Space]
BC    Battlecars
BC    Before Christ
BC    British Columbia
BC/BS    Blue Cross/Blue Shield
BCD    Bad Conduct Discharge
BCD    Binary Coded Decimal
BCDIC    Binary Coded Decimal Interchange Code
BCE    Before the Common Era (substitute for BC)
BCNU    Be Seeing You [Net jargon]
BCP    Byte Controlled Protocols
BCPL    Basic Combined Programming Language
BCS    Bachelor of Commercial Science
BCS    Binary Compatibility Standard
BCS    Boston Computer Society
BCS    British Computer Society
BD    Bachelor of Divinity
BD    Bank Draft
BD    Bills Discounted
BD&D    Basic Dungeons & Dragons
BDF    Binary Distribution Format
BDT    Billing Data Transmitter
BE    Bill of Exchange
BEF    British Expeditionary Force (see AEF)
BELCORE BELL COmmunications REsearch
BEM    Bug Eyed Monster
BEM    Bug-Eyed Monster [Space]
BENELUX BElgium, NEtherlands, and LUXembourg
BER    Bit Error Rate
BERT    Bit Error Rate Test
BEST    Borland Enhanced Support and Training
BF    Brought Forward
BFA    Bachelor of Fine Arts
BFD    Bristol (RI) Fire Department (probably typical of any town starting "B")
BH    Black Hole [Space]
BH    Boot Hill
BHP    Brake HorsePower
BICS    Building Industry Consulting Services [Telephony]
BID    Bis In Die (twice a day)
BIMA    Berkeley Illinois Maryland Array [Space]
BIOS    Basic Input Output System
BIS    Business Information System
BISDN    Broadband ISDN (q.v.) [Telephony]
BiSync    Binary Synchronous Communications (BSC is preferred) [IBM]
Bit    BInary digiT
BITNET    Because It's Time Network
BLAST    BLocked ASynchronous Transmission
BLERT    BLock Error Rate Test
BLF    Busy Lamp Field [Telephony]
BLT    Bacon, Lettuce, and Tomato (sandwich)
BLT    BLock Transfer [Instruction]
BLT    Branch Less Than [Instruction]
BM    Basal Metabolism
BM    Bowel Movement
BMA    Bank Marketing Association
BMEWS    Ballistic Missile Early Warning
BMO    Ballistic Missile Office
BMOC    Big Man On Campus
BMR    Basal Metabolism Rate
BNC    Bayonet Neill Concelman (connector) [Electronics] (see also TNC)
BNF    Bachus-Naur Form
BO    Body Odor
BO    Branch Office
BO    Buyer's Option
BOC    Bell Operating Company
BOD    Board Of Directors
BOF    Birds Of a Feather
BOM    Bill Of Materials
BOOTP    Bootstrap Protocol [Internet]
BOQ    Bachelor Officers' Quarters
BOS    Business Office Supervisor
BOSIX    Biin Open System Interface eXtension
BP    Blood Pressure
BP    British Petroleum
BP    British Pharmacopoeia
BPI    Bits Per Inch
BPL    Boston Public Library
BPL    Branch if PLus [Instruction]
BPOE    Benevolent and Protective Order of Elks
BPS    Bits Per Second
BR    Bills Receivable
BR    British Rail
BRA    Boston Redevelopment Authority
BRI    Basic Rate Interface (ISDN) [Telephony]
BRIEF    Basic Reconfigurable Interactive Editing Facility
BRL    army Ballistic Research Laboratory
BRS    Bibliographic Retrieval Service
BS    Bachelor of Science
BS    Bill of Sale
BSA    Birmingham Small Arms
BSA    Boy Scouts of America
BSc    Bachelor of SCience
BSC    Binary Synchronous Communications (also sometimes BiSync) [IBM]
BSD    Berkeley Software Distribution
BSN    Bachelor of Science in Nursing
BSS    Block Started by Symbol
BSTJ    Bell System Technical Journal
BT    British Telecom
BTAM    Basic Telecommunications Access Method [IBM]
BThU    British Thermal Unit (BTU {q.v.} is preferred)
BTL    Bell Telephone Laboratories
BTO    Bachman Turner Overdrive
BTU    British Thermal Unit
BTW    By The Way [Net jargon]
BU    Boston University
BUF    B-52 bomber ("Big Ugly Fellow") [USAF]
BV    Blessed Virgin
BWI    Baltimore-Washington International (airport)
BWI    British West Indies
BX    Base eXchange (see also PX)
c    centi- (metric 1/100)
C    programming language (successor to B, which was based on BCPL)
CA    California
CA    Chartered Accountant
CA    Chief Accountant
CA    Chronological Age
CA    Collision Avoidance (as in CSMA/CA (q.v.))
CAB    Civil Aeronautics Board
CACM    Communications of the Association for Computing Machinery
CAD    Computer Aided Design (sometimes seen as CAD/CAM)
CAD    Computer Aided Dispatching
CAE    Common Applications Environment
CAE    Computer Aided Engineering
CAI    Computer Aided Instruction
CAIS    Common Apse Interface Specification
CALS    Computer-aided Acquisition and Logistics Support
CAM    Computer Aided Management
CAM    Computer Aided Manufacturing (sometimes seen as CAD/CAM)
CAM    Content Addressable Memory
CAMA    Centralized Automatic Message Accounting [Telephony]
CAMP    Campaign Against Marijuana Planting
CAP    Civil Air Patrol
CAP    Columbia Appletalk Package
CAR    Contents of the Address part of the Register (LISP)
CARE    Committee on American Relief in Europe
CARP    California Air Resources Board
CASE    Computer Aided Software Engineering
CASSIS    Classification and Search Support Information System
CAT    Computer-Aided Tomography
CATIS    Common Applications and Tools Integration Services
CATV    Common Antenna TeleVision
CATV    Community Antenna TeleVision
CAVU    Ceiling And Visibility Unlimited
CB    Citizens Band radio
CBC    Canadian Broadcasting Corporation
CBD    Cash Before Delivery
CBD    Commerce Business Daily
CBEMA    Computer & Business Equipment Manufacturers Association
CBR    Chemical, Biological, Radiological warfare
CBS    Columbia Broadcasting System [Corporate name]
CBW    Chemical and Biological Warfare
CC    C (language) Compiler
CC    Carbon Copy
CCA    Computer Corporation of America [Corporate name]
CCAFS    Cape Canaveral Air Force Station [Space]
CCC    Canadian Committee on Cataloging
CCC    Civil(ian) Conservation Corps
CCC    Command, Control, and Communications (sometimes C^3)
CCC    Concourse Computer Center [MIT]
CCCCM    CCC CounterMeasures (sometimes C^3CM)
CCCI    Command, Control, Communications, and Intelligence
CCD    Charge Coupled Device (see CID)
CCD    Charge-Coupled Device [Space]
CCDS    Centers for the Commercial Development of Space [Space]
CCF    Hundred Cubic Feet
CCI    Computer Carrier Interrupt
CCI    Computer Consoles, Incorporated
CCIP    Continuously Computed Impact Point
CCIRN    Coordinating Committee for Intercontinental Research Networking
CCIS    Common Channel Interoffice Signaling [Telephony]
CCITT    Comite' Consultatif International Telegraphique et Telephonique
CCITT    Consultative Committee on International Telephony and Telegraphy
CCITT    International Telegraph and Telephone Consultative Committee
CCR    Commitment, Concurrency, and Recovery
CCR    Creedence Clearwater Revival [Music]
CCRI    Community College of Rhode Island [Corporate name]
CCRP    Continuously Computed Release Point
CCS    Hundred Call Seconds [Telephony]
CCS7    Common Channel Signalling (version #7) [Telephony, AT&T]
CCSA    Common Control Switching Arrangement [Telephony]
CCTA    Central Computer and Telecommunications Agency
CCTV    Closed Circuit TeleVision
CD    Carrier Detect (properly DCD (q.v.)) (EIA RS-232-C)
CD    Certificate of Deposit
CD    Civil Defense
CD    Collision Detection (as in CSMA/CD (q.v.))
CD    Compact Disk
CDA    Call Data Accumulator
CDA    Compound Documents Architecture
CDC    Centers for Disease Control
CDC    Control Data Corporation, Inc. [Corporate name]
CDEV    Control panel DEVice
CDIAC    Carbon Dioxide Information Analysis Center
CDO    Community Dial Office
CDR    CommanDeR
CDR    Contents of the Decrement part of the Register (LISP)
CD-ROM    Compact Disk Read Only Memory
CD-ROM    Compact Disk Read-Only Memory [Space]
CDSF    Commercially Developed Space Facility
CDT    Central Daylight Time
CDU    Control Display Unit
CE    Chemical Engineer
CE    Civil Engineer
CE    Common Era (substitute for AD)
CE    Corps of Engineers
CE    Customer Engineer (see also FE, SE)
CEA    Commissariat a l'Energie Atomique (Frenc Atomic Energy Commision)
CEA    Council of Economic Advisors
CEA    County Education Authority
CEC    Commission of the European Communities
CED    Committee for Economic Development
CELSS    Controlled Ecological Life Support System [Space]
CENS    Centre d'Etudes Nucleaires de Seclay
CENTO    CENtral Treaty Organization
CEO    Chief Executive Officer
CERFnet California Education and Research Federation Network
CERN    European Organization for Nuclear Research
CERN    organisation (formerly Conseil) Europeenne pour la Recherche Nucleaires
CERT    Computer Emergency Response Team
CEVI    Common Equipment Voltage Indicator
CF    Carry Forward
CF    Coin First (payphone) [Telephony]
CF    Cystic Fibrosis [Disease]
CFA    Center For Astrophysics [Space]
CFC    Chloro-FluoroCarbon [Chemical]
CFC    Combined Federal Campaign
CFD    Computational Fluid Dynamics
CFHT    Canada-France-Hawaii Telescope [Space]
CFI    Cost, Freight, and Insurance
CFL    Canadian Football League
CFO    Chief Financial Officer
CG    Coast Guard
CG    Commanding General
CGA    Color Graphics Adapter
CGCT    Compagnie Generale de Constructions Telephoniques
CG&E    Cincinnati Gas & Electric
CGE    Compagnie Generale d'Electricite
CH    Cardboard Heroes
CH    ClearingHouse
CH    CourtHouse
CH    Customs House
CHA    Champions
CHAP    CHAnnel Processor
CHARA    Center for High Angular Resolution Astronomy [Space]
CHI    Chill:    Adventures into the Unknown
CHOTS    Corporate Headquarters Office Technology System
CHP    California Highway Patrol
CI    Cubic Inches
CIA    Central Intelligence Agency [US Government]
CIA    Culinary Institute of America (Hyde Park, NY)
CIC    Carrier Identification Codes [Telephony] (10XXX codes)
CIC    Committee on Institutional Cooperation
CIC    Coordination and Information Center [CSNet]
CICA    Competition in Contracting Act
CICS    Customer Information Control System [IBM]
CID    Caller ID [Telephony] (see also: CLID, ANI)
CID    Central Institute for the Deaf
CID    Charge Injection Device (see CCD)
CID    Computer Integrated Design
CIDIN    Common Icao Data Interchange Network
CIM    Computer Integrated Manufacturing
CIO    Chief Information Officer
CIRRIS    Cryogenic InfraRed Radiance Instrument for Shuttle [Space]
CISC    Complex Instruction Set Computer
Cislunar    The space between the Earth and the Moon
CIT    California Institute of Technology
CIT    Case Institute of Technology (part of CWRU, Cleveland, OH)
CIT    Circumstellar Imaging Telescope [Space]
CLASP    Comprehensive Logistics Automated Support Program
CLASS    Custom Local Area Signaling Service [Telephony]
CLI    Command Line Interpreter
CLID    Calling Line ID [Telephony] (see also: CID, ANI)
CLNP    Connectionless-mode Network Protocol
CLNS    Connectionless-mode Network Service
CLR    Combined Line and Recording
CLRC    Circuit Layout Record Card
CLU    Chartered Life Underwriter
CLUT    Color LookUp Table
cm    centimeters
CM    Command Module (Apollo spacecraft) [Space]
CM    Congregation of the Mission
CMC    Communication Machinery Corp.
CMD    Centralized Message Distribution
CMIP    Common Management Information Protocol
CMIS    Common Management Information Services
CML    Current Model Logic
CMMU    Cache/Memory Management Unit
CMOS    Complementary Metal Oxide Semiconductor (see MOS)
CMOT    Common Management Information Services and Protocol Over TCP/IP
CMRR    Common Mode Rejection Ratio
CMS    Circuit Maintenance System
CMSgt    Chief Master Sergeant
CMU    Carnegie-Mellon University
CMYK    Cyan, Magenta, Yellow, blacK
CN    Canadian National [Corporate name, Railroading]
CN/A    Customer Name / Address [Telephony]
CNI    Common Network Interface [Telephony, AT&T] (Department of AT&T)
CNN    Cable News Network
CNO    Carbon-Nitrogen-Oxygen [Space]
CNO    Chief of Naval Operations
CNR    Canadian National Railways
CNR    Carrier to Noise Ratio
CNRI    Corporation for National Research Initiatives
CNRS    Centre National de la Recherche Scientifique (French National Center for Scientific Research)
CNS    Central Nervous System
CNSR    Comet Nucleus Sample Return [Space]
CO    Cash Order
CO    Central Office [Telephony]
CO    Colorado
CO    Commanding Officer
CO    Conscientious Objector
C/O    in Care Of
COB    Close Of Business
COBE    COsmic Background Explorer [Space]
COBOL    COmmon Business Oriented Language
COC    Call of Cthulhu
COCOT    Customer Owned, Coin Operated Telephone [Telephony]
COD    Collect On Delivery; Cash On Delivery
CODEC    COder-DECoder
COER    Central Office Equipment Report
COLA    Cost-Of-Living Allowance
COM    Computer Output (on) Microfiche
COM    Computer Output (on) Microfilm
COMAS    Central Office Maintenance and Administration System
COMM    Communications
COMPACT COMmercial Product ACquisition Team
COMPTEL COMPton TELescope (on GRO) [Space]
COMSAT    Communications Satellite [Space]
CONACYT Consejo Nacional de Cienca Y Tecnologia (Mexican National Council of Science and Technology)
CONS    Connection-Oriented Networking Service
CONS    Connection-Oriented Networking Session
CONS    CONStruct (LISP)
CORE    COntrolled Requirement Expression
CORN    COmputer Resource Nucleus
COS    Corporation for Open Systems
COSINE    Cooperation for Open Systems Interconnection Networking in Europe
COSMIC    COmmon System Main InterConnecting frame
COSMIC    COmputer Software Management and Information Center
COSMOS    COmputer System for Mainframe OperationS
COSTAR    Corrective Optics Space Telescope Axial Replacement [Space]
COT    Card Or Tape (NCR)
CP    Campus Police (MIT, others probably too)
CP    Canadian Pacific
CP    Chemically Pure
CP    Command Post
CP    Command Processor
CP    CoPy
CP    the Canadian Press
CPA    Certified Public Accountant
CPE    Customer Premises Equipment
CPE    Customer Provided Equipment
CPFF    Cost Plus Fixed Fee
CPI    Characters Per Inch
CPI    Common Programming Interface
CPL    Combined Programming Language
CPM    Control Program for Microcomputers (sometimes CP/M)
CPM    Control Program Monitor (sometimes CP/M)
CPO    Chief Petty Officer
CPO    Chief Post Office
CPR    Canadian Pacific Railway
CPS    Characters Per Second
CPSR    Computer Professionals for Social Responsibility
CPT    CaPTain
CPU    Central Processing Unit
CPW    Certified Public Weigher
CQ    Change of Quarters
CR    Carriage Return (ASCII 15 octal)
CRA    Cambridge Redevelopment Authority
CRAF    Comet Rendezvous / Asteroid Flyby [Space]
CRAM    Card Random Access Memory (NCR, but maybe others)
CRC    Chemical Rubber Company
CRC    Cyclic Redundancy Check
CREG    Concentrated Range Extension with Gain
CREN    The Corporation for Research and Educational Networking (merge of BITNET and CSNet)
CRRES    Combined Release / Radiation Effects Satellite [Space]
CRRES    Combined Release and Radiation Effects Satellite [NASA]
CRT    Cathode Ray Tube (also generic reference to a terminal)
CRTC    Canadian Radio-television and Telecommunications Commission
C&S    Chivalry & Sorcery
CS    Civil Servant
CS    Computer Science; Computing Science
CS    County Seat
CSA    Confederate States of America
CSAB    Computing Sciences Accreditation Board
CSACS    Centralized Status, Alarm and Control System
CSC    Computer Sciences Corporation
CSDC    Circuit Switched Digital Capability
CSF    Critical Success Factor
CSI    Commercial Systems Integration
CSIS    Canadian Security and Intelligence Service
CSL    Coin Supervising Link
CSM    Command and Service Module (Apollo spacecraft) [Space]
CSM    Command Sergeant Major
CSMA    Carrier Sense Multiple Access
CSMA/CA Carrier Sense Multiple Access with Collision Avoidance
CSMA/CD Carrier Sense Multiple Access with Collision Detection
CSNET    Computer + Science Network (merged with BITNET to make CREN)
CSO    Central Services Organization
CSOC    Consolidated Space Operations Center (at Colorado Springs)
CSP    Control Switching Point
CSR    Control and Status Register
CSR    Customer Service Representative [Telephony]
CSRG    Computer Systems Research Group
CSRS    civil Service Retirement System
CSS    Customer Switching System
CST    Central Standard Time
CSU    Channel Service Unit
CT    Central Time
C&T    Communications & Tracking [Space]
CT    Connecticut
CTC    Canadian Transport Commission
CTC    Centralized Traffic Control [Railroading]
CTD    Computing and Telecommunications Division
CTIO    Cerro Tololo Inter-american Observatory
CTIO    Cerro Tololo Interamerican Observatory [Space]
CTNE    Compania Telefonica Nacional de Espana
CTS    Clear To Send (EIA RS-232-C)
CTS    Compatible Timesharing System
CTV    Canadian TeleVision network
CU    Close-Up
CUA    Common User Access
CUL    See You Later [Net jargon]
CV    Curriculum Vitae
CW    Car Wars
CW    Chemical Warfare
CW    Child Welfare
CW    Churchwarden
CW    Churdwarden
CW    Continuous Wave
CWO    Cash With Order
CWO    Chief Warrant Officer
CWRU    Case Western Reserve University
CXI    Common X-windows Interface
CY    Calendar Year
CYO    Catholic Youth Organization
CZ    Canal Zone
D    Depth
DA    Days after Acceptance
DA    Department of Agriculture
DA    Deposit Account
D/A    Digital to Analog converter
DA    Directory Assistance (/C = computerized, /M = Microfilm) [Telephony]
DA    District Attorney
DA    Don't Answer [Telephony] (may be more general)
DAC    Digital to Analog Converter
DA/C    Directory Assistance/Computerized
DACCS    Digital Access Cross Connect System [Telephony] (suspect, see DACS)
DACS    Digital Access Cross-connect System [Telephony]
DAD    Draft ADdendum
DAG    Directed Acyclic Graph
DAL    Dedicated Access Line [Telephony]
DA/M    Directory Assistance/Microfilm
DAP    Division Advisory Panel (of NSF (q.v.) DNCRI (q.v.))
DAR    Daughters of the American Revolution
DARE    Drug Abuse Resistance Education
DARPA    Defense Advanced Research Projects Agency (of the DoD, see also ARPA)
DASD    Direct Access Storage Device
DAT    Digital Audio Tape
DATA    Defense Air Transport Administration
DAV    Disabled American Veterans
DB    DataBase
db    decibel(s)
dba    doing business as
DBF    DBase Format
DBME    DataBase Managment Environment
dbms    DataBase Management System (rdbms for Relational ...)
DBRAD    Data Base Relational Application Directory
DC    Direct Current (dc, see also AC)
DC    District of Columbia
DCA    Defense Communications Agency
DCA    Distributed Communication Architecture
DCA    Document Content Architecture
DCC    Descriptive Cataloging Committee
DCCO    Defense Commercial Communications Office
DCD    Data Carrier Detect (sometimes CD (q.v.)) (EIA RS-232-C)
DCE    Data Communication Equipment
DCL    Digital Command Language
DCP    Distributed Communications Processor
DCTS    Dimension Custom Telephone Service
DD    Daredevils
DD    Data Dictionary
DD    Days after Date
DD    Demand Draft
DD    Dishonorable Discharge
DD    Disk Drive
DD    Doctor of Divinity
D&D    Dungeons & Dragons
DDC    Digital Data Converter
DDCU    DC-to-DC Converter Unit [Space]
DDD    Direct Distance Dialing [Telephony] (principally US, elsewhere STD)
DDL    Document Description Language
DDN    Defense Data Network
DDP    Distributed Data Processing
DDS    Dataphone Digital Service [AT&T]
DDS    Digital Data Service
DDS    Direct Digital Service
DDS    Doctor of Dental Science
DDS    Doctor of Dental Surgery
DDT    DEC Debugging Tape
DDT    Di-<something> (pesticide)
DDT    Dynamic Debugging Technique
DE    Delaware
DEA    Drug Enforcement Agency [US Government]
DEAR    Department of Energy Acquisition Regulation
DEC    Digital Equipment Corporation [Corporate name]
DECUS    Digital Equipment Corporation Users Society
DES    Data Encryption Standard [NIST]
DEW    Distant Early Warning (as in DEW Line)
DF    Damage Free
D/F    Direction Finding
DFC    Distinguished Flying Cross
DFD    Data Flow Diagram
DFE    Data Flow Editor
DFM    Distinguished Flying Medal
DFN    Deutsche Forschungsnetz Verein (German Research Network Association)
DFRF    Dryden Flight Research Facility [Space]
DFS    Depth-First Search
DFW    Dallas-Ft.Worth (regional airport)
DG    Data General [Corporate name]
DG    Dei Gratia (by the grace of God)
DG    Director General
DGSC    Defense General Supply Center
DHHS    Department of Health and Human Services
DHSS    british Department of Health and Social Security
DHSS    Department of Health and Social Security (British)
DIA    Document Interchange Architecture
DIAD    (magnetic) Drum Information Assembler / Dispatcher
DIAL    Direct Information Access Line
DIAS    Defense Automatic Integrated System
DID    Direct Inward Dialing [Telephony]
DIF    Document Interchange Format
DIN    Deutsches Institut fur Normung
DIRE    Dire Is Really Emacs
DIS    Draft International Standard [ISO]
DISA    Data Interchange Standards Association
DISOSS    Distributed Office Support System [IBM]
DIY    Do It Yourself
DJ    Disc Jockey
DLA    Defense Logistics Agency
DLI    Data Link Interface(?)
DLL    Data Link Layer [ISO OSI]
DLL    Dial Long Line equipment
DLO    Dead Letter Office
DM    Dungeon Master
DMA    Direct Memory Access
DMD    Doctor of Dental Medicine
DME    Distance Measuring Equipment
DMF    Probably part of an X.400 address in Europe
DMOS    Diffusion Metal Oxide Semiconductor (see MOS)
DMSP    Defense Meteorological Satellite Program [Space]
DMV    Department of Motor Vehicles
DMV    Department of Motor Vehicles (Calif)
DMZ    DeMilitarized Zone
DNA    DeoxyriboNucleic Acid
DNA    Digital Network Architecture [DEC]
DNCRI    [NSF] (q.v.) Division of Networking and Communications Research and Infrastructure
DNHR    Dynamic NonHierarchical Routing
DNIC    Data Network Identification Code [Telephony]
DNIS    Dialed Number Identification Service (see also DID) [Telephony]
DNL    Director of Naval Laboratories
DNR    Dialed Number Recorder [Telephony]
DNS    Domain Name System
DOA    Dead On Arrival
DOB    Date Of Birth
DOC    Dynamic Overload Control
DOD    Department Of Defense [US Government] (sometimes DoD)
DOE    Department of Energy [US Government]
DOHC    Dual OverHead Cams [Automotive]
DOMAIN    Distributed Operating Multi Access Interactive Network (Apollo)
DOS    Disk Operating System
DOT    Department Of Transportation [US Government]
DOT&E    Director, Operational Test and Evaluation
DOV    Data Over Voice [Telephony]
DOY    Day of Year
DP    Data Processing
DP    Dial Pulse [Telephony]
DP    Displaced Persons (expelled from native land)
DP    Display Postscript
DP    Double Penetration
DP    Double Play
DP    Draft Proposal
DPA    Delegation of Procurement Authority
DPANS    Draft Proposed American National Standard
DPI    Dots Per Inch
DPS    Display PostScript
DQ    Dairy Queen
DQ    Dragon Quest
DQDB    Distributed Queue Dual Bus (IEEE 802.6) [Telephony, Networking]
DQL    Database Query Language
DR    Dead Reckoning
DR    Dining Room
DRAM    Dynamic Random Access Memory (as opposed to static RAM)
DRD    Data Reading Device
DRE    Directional Reservation Equipment
DRG    Democratic Republic of Germany (East Germany)
DRI    Defense Research Internet
DRI    Digital Research, Incorporated [Corporate name]
DS    Double-Sided
DS    Draft Standard
DSA    Dial System Assistance
DSE    Data Structure Editor
DSEE    Domain Software Engineering Environment
DSM    Distinguished Service Medal
DSO    Distinguished Service Order
DSP    Decessit Sine Prole (died without issue)
DSP    Digital Signal Processing
DSRI    Digital Standard Relational Interface
DSS    Decision Support System
DSS    Direct Station Selection [Telephony]
DST    Daylight Saving Time
DSTN    Double SuperTwisted Nematic
DSU    Digital Service Unit
DT    Delirium Tremens
DTE    Data Terminal Equipment
DTF    Dial Tone First payphone [Telephony]
DTMF    Dial Tone Multi Frequency [Telephony]
DTP    DeskTop Publishing
DTR    Data Terminal Ready (EIA RS-232-C)
DUI    Driving Under the Influence
DUT    Device Under Test
DV    Deo Vo lente (God willing)
DVM    Digital Volt Meter
DVM    Doctor of Veterinary Medicine
DWAPS    Defense Warehousing Automated Processing System
DWI    Died Without Issue [Genealogy]
DWI    Driving While Intoxicated
DWIM    Do What I Mean
DX    Distance (as in long distance radio communication)
DXT    Data eXtractT facility
E    East
E    Espionage
EADASS    Engineering and Administrative Data AcquiSition System
EAFB    Edwards Air Force Base [Space]
EAN    Certainly part of an X.400 Address in Europe
EARN    European Academic Research Network
EAS    Extended Area Service (or Engineering Admin. System)
EASI    European Academic Supercomputer Initiative (of IBM)
EBCDIC    Extended Binary Coded Decimal Interchange Code
EC    Exchange Carrier [Telephony]
ECAFE    Economic Commission for Africa and the Far East
ECASS    Electronically Controlled Automatic Switching System
ECASS    Export Control Automated Support System
ECC    Error Correction Code
ECC    Error Correction Code (corrects error in memory or transmission)
ECCM    Electronic Counter-CounterMeasures
ECDO    Electronic Community Dial Office
ECG    ElectroCardioGram
ECL    Emitter Coupled Logic (see also TTL)
ECLSS    Environmental Control and Life Support System [Space]
ECM    Electronic Counter Measure
ECM    European Common Market
ECMA    European Computer Manufacturers Association
ECO    Ecological
ECO    Electronic Central Office
ECO    Engineering Change Order
ECPA    Electronic Communications Privacy Act [US law]
ECS    Environmental Control System [Space]
ECT    ElectroConvulsive Therapy
ECV    Electric Cargo Vehicle [NASA OEXP]
ED&D    Expert Dungeons & Dragons
EDGAR    Electronic Data Gathering, Analysis, and Retrieval
EDI    Electronic Data Interchange
EDIF    Electronic Design Interchange Format
EDO    Extended Duration Orbiter [Space]
EDP    Electronic Data Processing
EDS    Electronic Data Systems
EDT    Eastern Daylight Time
EDTA    Ethylene Diamine Tetraacetic Acid
EDTCC    Electronic Data Transmission Communications Central
EE    Electrical Engineer
EE    Electrical or Electronics Engineer
EEC    European Economic Community
EEC    European Economic Comunity
EEG    ElectroEncephaloGram
EEL    Epsilon Extension Language
E&EO    Errors and Omissions Excepted
EEPROM    Electrically Erasable Programmable Read Only Memory
EFF    Electronic Frontier Foundation
e.g.    ??? (Latin(?): for example)
EGA    Enhanced Graphics Adapter
EGP    Exterior Gateway Protocol [Internet]
EGRET    Energetic Gamma Ray Experiment Telescope (on GRO) [Space]
EHF    Extremely High Frequency (30-300GHz)
EIA    Electronic Industries Association
EINE    EINE Is Not Emacs
EISA    Extended Industry-Standard Architecture
EISS    European Intelligence Support System
EKG    ElectroKardioGramm (see ECG)
EL    ElectroLuminescent (as in display)
ELF    Extremely Low Frequency
ELO    Electric Light Orchestra
ELP    Emerson, Lake and Palmer (or Powell)
ELV    Expendable Launch Vehicle [Space]
E&M    ``Ear and Mouth''; receive and transmit leads of a signalling system
EM    Enlisted Man (see EW)
EMA    Electronic Mail Association
EMACS    Editor MACroS
EMACS    Eight Megabytes And Constantly Swapping
E-MAIL    Electronic MAIL
EMF    ElectroMotive Force
EMF    ElectroMotive Force (voltage)
EMI    ElectroMagnetic Interference
EMP    Electromagnetic Pulse
EMPRESS EnvironMental Pulse Radiation Environment Simulator for Ships
EMR    ElectroMagetic Response
EMR    ElectroMagnetic Response
EMS    Electronic Message System
EMS    Extended Memory Specification
EMT    Emergency Medical Technician
EMU    ElectroMagnetic Unit
EMU    Extravehicular Mobility Unit [Space]
ENIAC    Electronic Numerical Integrator and Calculator
ENS    ENSign
EO    End Office [Telephony]
EO    Erasable Optical
EOF    End Of File
EOM    End Of Month
EOS    Earth Observing System [Space]
EOWG    Engineering and Operations Working Group (under FNC)
EP    Experience Points
EP    Extended Play
EPA    Environmental Protection Agency
EPOS    Engineering and Project-management Oriented Support system
EPRI    Electric Power Research Institute
EPROM    Erasable Programmable Read Only Memory
EPS    Encapsulated PostScript
EPT    Empire of the Petal Throne
EQ    Educational Quotient (see IQ)
ER    Emergency Room
ERA    Earned Run Average
ERA    Entity-Relationship-Attribute
ERA    Equal Rights Amendment
ERD    Entity-Relation Diagram
ERE    Entity Relationship Editor
ERT    Earth Resources Technology [Space]
ES    Expert System
ESA    European Space Agency
ESA    European Space Agency [Space]
ESAC    Electronic Systems Assistance Center
ESDI    Enhanced Standard Device Interface
ESE    East South East
ESF    Extended Superframe Format [Telephony]
ESM    Electronic Support Measures
ESnet    Energy Sciences network (DoE) [Networking]
ESO    European Southern Observatory
ESO    European Southern Observatory [Space]
ESP    Extra Sensory Perception
ESPS    Entropic Signal Processing System
ESS    Electronic Switching System [Telephony]
ESSEX    Experimental Solid State EXchange
EST    Eastern Standard Time
ET    Eastern Time
ET    Extra Terrestrial [Space]
ET    (Shuttle) External Tank [Space]
ETA    Estimated Time of Arrival
ET/ACC    External Tank/Aft Cargo Carrier (see also ET) [Space]
ETC    Et cetera, and so on...
ETD    Estimated Time of Departure
ETFD    Electronic Toll Fraud Device [Telephony]
ETH    Eidgn\:oessiche Technische Hochschule (Swiss Federal Institute of Technology)
ETLA    Extended Three Letter Acronym [Space]
ETO    Earth-to-Orbit [Space]
ETR    Eastern Test Range [Space]
ETS    Electronic Translator System
ETV    Education TeleVision
EUUG    European Unix User Group
EUV    Extreme UltraViolet
EUV    Extreme UltraViolet [Space]
EUVE    Extreme UltraViolet Explorer [Space]
EVA    ExtraVehicular Activity
EVA    ExtraVehicular Activity [Space]
EVX    Electronic Voice eXchange
EW    Electronic Warfare
EW    Enlisted Woman (see EM)
EWOS    European Workshop for Open Systems
FA    Football Association (British soccer--a word derived from Association)
FAA    Federal Aviation Agency [US Government]
FACD    Foreign Area Customer Dialing
FAO    Food and Agriculture Organization [US Government]
FAQ    Frequently Asked Questions [Space]
FAR    Federal Acquisition Regulations
FAS    Foreign Agricultural Service
FAS    Free Alongside Ship
FASST    Flexible Architecture Standard System Technology
FAST    Fast Auroral SnapshoT explorer [Space]
FAT    Foreign Area Translation
FAX    FAcsimile
FB    Freight Bill
FBI    Federal Bureau of Investigation [US Government]
FCC    Federal Communications Commission [US Government]
FCC    Federal Computer Conference
FCCSET    Federal Coordinating Committee for Science, Education and Technology (under OSTP) {Maybe Eng. for Edu.??}
FCO    Field Change Order
FCO    Frequency Controlled Oscillator
FCS    Frame Check Sequence
FDA    Food and Drug Administration [US Government]
FDDI    Fiber Digital Data Interface
FDDI    Fiber Distributed Data Interface
FDHD    Floppy Drive High Density
FDIC    Federal Deposit Insurance Corporation
FDIC    Federal Deposit Insurance Corporation [US Government]
FDM    Frequency Division Multiplexing
FDR    Franklin Delano Roosevelt [US President]
FE    Field Engineer (see also CE, SE)
FEA    Finite Element Analysis
FEDSIM    FEDeral Systems Integration and Management center
FEMA    Federal Emergency Management Agency
FEMF    Foreign EMF (q.v.) (a.k.a. Cross Battery) [Telephony]
FEPC    Fair Employment Practices Commission
FEPG    Federal Engineering Planning Group (of FNC under EOWG, originally of FRICC)
FERS    Federal Employees Retirement System
FET    Federal Excise Tax
FET    Field Effect Transistor
FFA    Future Farmers of America
FFT    Fast Fourier Transform
FFT    Fast Fourier Transform [Space]
FG-A    Feature Group A [Telephony] (Line Side termination for LD carriers)
FG-B    Feature Group B [Telephony] (Trunk Side termination for LD carriers (aka ENFIA B), 950 service)
FG-D    Feature Group D [Telephony] (Trunk Side termination for LD carriers, 1+ service)
FGS    Fine Guidance Sensors (on HST) [Space]
FHA    Federal Home Administration
FHA    Future Homemakers of America
FIB    Focused Ion Beam
FICA    Federal Insurance Contributions Act
FIDO    Fog Investigation Dispersal Operation
FIFO    First In First Out (as in registers and buffers)
FILO    First In Last Out (see also FIFO)
FIMS    Forms Interface Management System
FINE    FINE Is Not Emacs
FIO    Frequency In and Out
FIPS    Federal Information Processing Standard
FIR    Far InfraRed [Space]
FIR    Finite Impulse Response
FIRMR    Federal Information Resource Management Regulation
FIT    Federal Information Technologies, inc.
FITS    Flexible Image Transport System [Space]
FIX    Federal Inter-agency eXchange [Networking]
FL    Florida
FLACC    Full Level Algol Checkout Compiler
FLL    Fixed Loss Loop [Telephony]
FLOP    FLoating point OPeration
FLOPS    FLoating-point OPerations per Second
FLRA    Federal Labor Relations Authority
FM    Frequency Modulation
FMB    Federal Maritime Board
FMCS    Federal Mediation and Conciliation Service
FMR    Follow Me Roaming [Telephony]
FMS    Financial Management Service (Treasury Dept)
FMS    Forms Management System
FNC    Federal Networking Council (formerly FRICC) [US Government] (under OSTP)
FO    Foreign Office
FO    Forward Observer
FOAC    Federal Office Automation Center
FOB    Free On Board
FOB    Full Of Bull (aperiodical of) [TMRC]
FOC    Faint Object Camera (on HST) [Space]
FOC    Free Of Charge
FOIA    Freedom Of Information Act
FOIMS    Field Office Information Management System
FOOBAR    See FUBAR [Net jargon]
FOR    Free On Rail
FORCS    Faa's Operational Reporting Communication System
FORD    Fix Or Repair Daily [Humor]
FORD    Found On Road Dead [Humor]
FORTRAN FORmula TRANslator
FOS    Faint Object Spectrograph (on HST) [Space]
FOSE    Federal Office Systems Exposition
FOT    Free On Truck
FOV    Field Of View
FPA    Floating Point Accelerator
FPC    Fish Protein Concentrate
FPE    Floating Point Engine
FPHA    Federal Public Housing Authority
FPLA    Field Programmable Logic Array (see PLA)
FPM    Feet Per Minute
FPO    Field Post Office
FPO    Fleet Post Office
fps    Feet Per Second
FPU    Floating Point Unit
FQDN    Fully Qualified Domain Name [TCP/IP] (DNS)
FR    Frame Relay [Telephony, Networking]
FRACTAL FRACTional dimensionAL
FRED    Fred Resembles Emacs Deliberately
FRG    Federal Republic of Germany (West Germany)
FRICC    Federal Research Internet Coordinating Committee (now FNC, q.v.) [Networking, US Government]
FROG    Free Rocket Over Ground
FRPG    Fantasy Role Playing Game
FRS    Federal Reserve System
FS    Field Service
FS    File System
FS    Full Standard
FSF    Free Software Foundation
FSK    Frequency Shift Keying
FSLIC    Federal Savings and Loan Insurance Corporation
FSS    Federal Supply Service
FSW    Forward Swept Wings
Ft    Foot
FTAM    File Transfer And Management (ISO upscale FTP)
FTC    Federal Trade Commission
FTL    Faster Than Light
FTP    File Transfer Protocol (esp. of the TCP/IP suite)
FTS    Federal Telecommunications System [Telephony, US Government]
FTS    Flight Telerobotic Servicer [Space]
FUBAR    F***ed Up Beyond All Recognition/Repair
FUBAR    Fouled Up Beyond All Recognition/Repair
FUSE    Far Ultraviolet Spectroscopic Explorer [Space]
FW    Fringeworthy
FWD    Front Wheel Drive
FWHM    Full Width at Half Maximum [Space]
FX    Foriegn eXchange [Telephony]
FY    Fiscal Year
FYI    For Your Information
G    General audiences [Movie rating]
G    Gravity
GA    Gamblers Anonymous
GA    General Assembly
GA    General Average
GA    General of the Army
GA    Georgia
GAAP    Generally Accepted Accounting Principles
GAB    Group Audio Bridging [Telephony]
Gaia    Earth's self-sustaining Biosphere (Not an acronym, from some ancient language, I think)
GAN    Global Area Network
GAO    General Accounting Office [US Government]
GAR    Grand Army of the Republic
GARR    Gruppo Arminizzazione Rete por la Ricerca (Italian Research Network Harmonization Group)
GAS    Get-Away Special [Space]
GATT    General Agreement on Tariffs and Trade
GAW    Guaranteed Annual Wage
GAW    Guarenteed Annual Wage
GB    Gangbusters
GB    GigaByte
GB    Great Britain
GBIP    General Purpose Interface Bus
GBT    Green Bank Telescope [Space]
GC    Garbage Collection (LISP)
GC    Gas Chromatograph (or Chromatography)
GCA    Ground Controlled Approach
GCC    Gnu C Compiler
GCD    Ground Controlled Descent
GCL    Graphics Command Language
GCM    General Court Martial
GCR    Group-Coded Recording (magnetic tape, 6250 bpi)
GCT    Greenwich Civil Time
GCVS    General Catalog of Variable Stars [Space]
GDB    Gnu DeBugger
GDP    Gross Domestic Product
GDS    Great Dark Spot [Space]
GE    General Electric
GEM    Giotto Extended Mission [Space]
GEM    Graphics Environment Manager
GEO    Geosynchronous Earth Orbit [Space]
GHQ    General HeadQuarters
GHRS    Goddard High Resolution Spectrograph (on HST) [Space]
GHz    Giga HertZ (unit of frequency, 1,000,000,000 cycles per second)
GI    Galvanized Iron
GI    Gastro Intestinal (as in upper GI)
GI    General Issue
GI    Government Issue
GID    Group ID [UNIX]
GIF    Graphics Interchange Format
GIGO    Garbage In Garbage Out
GIN    Graphics INput
GISS    Goddard Institute for Space Studies
GKS    Graphical Kernel Standard
GKS    Graphics Kernel System
GM    Game Master
GM    General Manager
GM    General Motors [Corporate name, Automobile]
GM    Guided Missile
GMBH    Gesellschaft Mit Beschraenkter Haftung
GMC    Giant Molecular Cloud [Space]
GMD    Gesellschaft f\:ur Mathematik und Datenverarbeitung (German Institute for Mathematics and Data Processing)
GMRT    Giant Meter-wave Radio Telescope [Space]
GMT    Greenwich Mean Time (also called UT)
GNP    Gross National Product
GNU    GNU's Not Unix
GOES    Geostationary Orbiting Environmental Satellite [Space]
GOES    Geostationary Orbiting Environmental Satellites [Space]
GOSIP    Government Open Systems Interconnection Profile (calls for government procurement of ISO/CCITT products)
GOSIP    Government OSI Profile
GP    General Practitioner
GP    General Purpose (RR engines and origin of Jeep) [Railroading, Automobile]
GPC    General Purpose Computer [Space]
GPI    Graphics Programming Interface
GPIB    General Purpose Interface Bus
GPIB    General-Purpose Interface Bus
GPL    GNU General Public Licence
GPO    General Post Office
GPO    Government Printing Office
GPS    Global Positioning System
GPS    Global Positioning System [Space]
GQ    General Quarters
GRB    Gamma Ray Burst(er)
GREP    Global Regular Expression Print, g/re/p, (UNIX command)
GREP    Global Regular Expression Print [UNIX]
GRO    Gamma Ray Observatory [Space]
GRS    Gamma Ray Spectrometer (on Mars Observer) [Space]
GRS    Great Red Spot [Space]
GS    General Schedule
GS    Glide Slope
GSA    General Services Administration
GSA    General Services Adminstration [US Government]
GSA    Girl Scouts of America
GSBCA    General Services administration Board of Contract Appeals
GSC    Guide Star Catalog (for HST) [Space]
GSFC    Goddard Space Flight Center (Greenbelt, MD) [NASA, Space]
GSI    Gesellschaft f\:ur Schwerionenforschung (German Federal Research Institute for Heavy Ion Research)
GSM    Global System Mobile
GSM    Groupe Speciale Mobile (Committee Designing preceding)
GSTS    Ground-based Surveillance and Tracking System
GT    Gross Ton
GTE    General Telephone and Electric [Corporate name]
GTO    Geostationary Transfer Orbit [Space]
GTSI    Government Technology Services, inc.
GUI    Graphical User Interface
GW    Gamma World
GWEN    Ground Wave Emergency Network
GWM    Generic Window Manager [X]
H    Harn
H    Height
HACD    Home Area Customer Dialing
HAL    Heuristically programmed ALgorithmic computer (movie 2001)
HAM    Hold And Modify
HAO    High Altitude Observatory [Space]
Hb    HemogloBin
HBM    Her British Majesty; His British Majesty
HBO    Home Box Office
HC    Holy Communion
HC    House of Commons
HCFA    Health Care Financing Administration
HCFC    hydrochlorofluorocarbon [Chemical]
HCL    High Cost of Living
HD    Hard Disk
HD    Heavy Duty
HD    Henry Draper catalog entry [Space]
HDA    Head Disk Assembly (in winchester disk drives)
HDBV    Host Data Base View
HDL    High Density Lipoprotein
HDLC    High-level Data Link Control [Networking]
HDTV    High Definition Television
HE    His Eminence
HE    His Excellency
HEAO    High Energy Astronomical Observatory [Space]
HEDM    High Energy-Density Matter [Space]
HEMP    Help End Marijuana Prohibition
HEO    High Earth Orbit [Space]
HEPnet    High Energy Physics network [Networking]
HERO    Hazards of Electromagnetic Radiation to Ordnance
HF    High Fantasy
HF    High Frequency (3-30MHz)
HFE    Human Factors Engineering
HFS    Hierarchical File System
HGA    High Gain Antenna [Space]
HHS    (US Department of) Health and Human Services
HI    Hawaii
HIIPS    Hud Integrated Information Processing Services
HLC    Heavy Lift Capability [Space]
HLL    High-Level Language
HLV    Heavy Lift Vehicle [Space]
HMC    Halley Multicolor Camera (on Giotto) [Space]
HMOS    High performance Metal Oxide Semiconductor (see MOS)
HMS    His/Her Majesty's Ship
HMT    His/Her Majesty's Transport
HNPA    Home Numbering Plan Area [Telephony]
HOBIS    HOtel Billing Information System
HOL    High-Order System
HOTOL    HOrizontal Take-Off and Landing
HP    Hewlett Packard, Inc. [Corporate name]
HP    High Pressure
HP    Higher Power (sort of an AA "in" term, usually God)
HP    Hit Points
HP    HorsePower
HPGe    High Purity Germanium
HPL/T    High-Productivity Languages/Tools
HQ    HeadQuarters
HR    Hertzsprung-Russell (diagram) [Space]
HR    House of Representatives
HRH    Her Royal Highness
HRH    His Royal Highness
HRI    High Resolution Imager (on ROSAT) [Space]
HS    High School
HSB    Hue, Saturation, Brightness
HSP    High Speed Photometer (on HST) [Space]
HST    Hawaiian Standard Time
HST    Hubble Space Telescope [Space]
HT    High Tension (as in electric power transmission)
HTK    Hits To Kill
HUAC    House Unamerican Activities Committee
HUD    Heads Up Display
HUD    Housing and Urban Development [US Government]
HUPD    Harvard University Police Department
HUT    Hopkins Ultraviolet Telescope (ASTRO package) [Space]
HV    High Voltage
HVAC    Heating, Ventilation, and Air Conditioning
HW2000    Highway 2000
HWM    High-Water Mark
Hz    HertZ (unit of frequency, cycles per second)
IAB    Internet Activities Board [Networking]
IAEA    International Atomic Energy Agency
IANA    Internet Assigned Numbers Authority ([e-mail])
IATA    International Air Transport Association
IAU    International Astronomical Union [Space]
IAUC    IAU Circular [Space]
IBM    Ingrained Batch Mentality
IBM    International Business Machines, Inc. [Corporate name]
IBM    Itty Bitty Machines
IBT    Illinois Bell Telephone
IC    Integrated Circuit
IC    Interexchange Carrier [Telephony] (see also IEC, IXC)
ICB    Interstate Computer Bank
ICBM    InterContinental Ballistic Missile
ICE    In-Circuit Emulator
ICE    International Cometary Explorer [Space]
ICI    Imperial Chemical Industries
ICJ    International Court of Justice
ICL    International Computers Ltd.
ICMP    Internet Control Message Protocol
ICP    Integrated Channel Processor
ICP    Inventory Control Points
ICRC    International Cosmic Ray Conference
ID    Idaho
ID    IDentification
IDA    Intercommunication Data Areas
IDA    International Dark-sky Association [Space]
IDA    International Development Association
IDDD    International Direct Distance Dial [Telephony]
IDE    Interactive Development Environments, inc
IDF    Intermediate Distributing Frame [Telephony]
IDL    Interactive Data Language [Space]
IDV    Interlibrational Derived Vehicle [Space]
i.e.    ???? (Latin(?): in other words (?))
IE    Indo-European
IEC    Inter-Exchange Carrier [Telephony] (see also IC, IXC)
IEE    Institute of Electrical Engineers [UK]
IEEE    Institute of Electrical and Electronic Engineers
IETF    Internet Engineering Task Force
IF    Intermediate Frequency (as in IF stage)
IFB    Invitation For Bids
IFC    International Finance Corporation
IFC    International Freighting Corporation
IFF    Identification - Friend or Foe
IFF    Interchange File Format
IFLA    International Federation of Library Associations
IFR    Instrument Flight Rules [Aviation]
IGES    Initial Graphics Exchange Standard
IGM    InterGalactic Medium [Space]
IGY    International Geophysical Year
IGY    International Geophysical Year [Space]
IHP    Indicated HorsePower
IHS    Integrated Hospital Support
IIA    Information Industry Association
IIE    Institute of Industrial Engineers
IIHF    International Ice Hockey Federation
IIL    Integrated Injection Logic
ILO    International Labor Organization
ILS    Instrument Landing System
ILV    Industrial Launch Vehicle [Space]
IMF    International Monetary Fund
IMHO    In My Humble Opinion [Net jargon]
IMO    In My Opinion [Net jargon]
IMP    Interface Message Processor [ARPANET/MILNET] (replaced by PSN)
IMSL    International Mathematical Subroutine Library
IN    Indiana
INADS    INitialization and ADministration System [Telephony]
INRA    Iesus Nazerenus Rex Iudaeorum (Jesus of Nazareth, King of the Jews)
INRIA    Institut National de Recherche en Informatique et Automatique
INS    Immigration and Naturalization Service
In-situ In Place [Latin]
INSTITUTE    INSTITUTE's Name Shows That It's Totally Unrelated To EMACS
INTAP    INteroperability Technology Association for information Processing
INWATS    INward Wide Area Telephone Service [Telephony]
I/O    Input/Output
IO    Input/Output (sometimes I/O)
IOC    International Operating Center [Telephony, US]
IOD    Identified Outward Dialing
IOOF    International Order of Odd Fellows
IOTA    Infrared-Optical Telescope Array [Space]
IOTA    International Occultation Timing Association [Space]
IOU    I Owe you(U)
IP    Information Provider [Telephony]
IP    Innings Pitched
IP    Intermediate Point
IP    Internet Protocol
IPC    Inter-Process Communication
IPE    Integrated Programming Environment
IPMS    InterPersonal Message Services
IPS    Inertial Pointing System [Space]
IPS    Information Processing Standards
IPSE    Integrated Project-Support Environment
IQ    Intelligence Quotient (see EQ)
IR    Index Register
IR    Infra-Red
IRA    Individual Retirement Account
IRA    Irish Republican Army
IRAF    Image Reduction and Analysis Facility [Space]
IRAS    InfraRed Astronomical Satellite [Space]
IRBM    Intermediate Range Ballistic Missile
IRDS    Information Resource Dictionary Standard
IRDS    InfraRed Detection Set
IRE    Institute of Radio Engineers (old name for the now IEEE, which see)
IRM    Information Resources Management
IRMS    Information Resources Management Service
IRS    Internal Revenue Service
IRTF    Internet Research Task Force
IS    Information Systems
IS    International Standard [ISO] (Beyond the DIS Stage)
ISA    Industry-Standard Architecture
ISAM    Indexed Sequential Access Method
ISAS    Institute of Space and Astronautical Science (Japan) [Space]
ISBD    International Bibliographic Description
ISC    Information Services Center
ISC    International Switching Center
ISCH    Interstitial-Cell-Stimulating Hormone (same as LH)
ISDN    Integrated Services Digital Network [Telephony]
ISDT    Integrated Systems Development Tool
ISEE    International Sun Earth Explorer (usually ISEE-3)
ISF    Information Systems Factory
ISFUG    Integrated Software Federal User Group
ISI    Information Sciences Institute
ISM    InterStellar Medium [Space]
ISO    Infrared Space Observatory [Space]
ISO    International Organization for Standardization
ISO    International Standards Organization [Space]
ISODE    ISO Development Environment
ISOO    Information Security Oversight Office
ISPM    International Solar Polar Mission
ISPM    International Solar Polar Mission (now Ulysses) [Space]
ISR    Institute of Snow Research
ISRG    Independent Space Research Group
ISV    Independent Software Vendor
ISY    International Space Year [Space]
IT    Industrial Technology
IT    Information Technology
ITC    Inter-Task Communication
ITS    Incompatible Timesharing System
ITT    International Telephone and Telegraph
ITU    International Telecommunications Union
ITUSA    IT Users Standards Association
IUE    International Ultraviolet Explorer [Space]
IUS    Inertial Upper Stage
IUS    Inertial Upper Stage [Space]
IUV    Interlibrational Utility Vehicle [Space]
IXC    Inter-eXchange Carrier [Telephony] (see also IC, IEC)
IXI    International (pan-European) X.25 Infrastructure
JACM    Journal of the Association for Computing Machinery
JANET    Joint Academic Network (UK)
JBS    John Birch Society
JC    Jesus Christ
JC    Joint Compound (plumbing)
JC    Julius Caesar
JC    Junior College
JCA    Jewelry Crafts Association
JCAC    Joint Civil Affairs Committee
JCAE    Joint Committee on Atomic Energy
JCEE    Joint Council on Economic Education
JCET    Joint Council on Educational Television
JCS    Joint Chiefs of Staff
JD    Justice Department
JDS    John Dewey Society
JEM    Japanese Experiment Module (for SSF) [Space]
JES    John Ericsson Society
JET    Joint European Torus (fusion research)
JFK    John F. Kennedy
JFK    John F. Kennedy (international airport)
JFMIP    Joint Financial Management Improvement Program
JGR    Journal of Geophysical Research
JGR    Journal of Geophysical Research [Space]
JI    Justice, Inc.
JIC    Joint Intelligence Center
JIC    Just in Case
JILA    Joint Institute for Laboratory Astrophysics [Space]
JIM    Job Information Memorandum
JINTACCS    Joint INteroperability of TActical Command and Control Systems
JIS    Japan Industrial Standards
JISC    Japanese Industrial Standards Committee
JIT    Just In Time
JMS    John Milton Society
JNT    Joint Network Team (UK)
JO    Job Order
JO    Junior Officer
JOVE    Jonathan's Own Version of Emacs
JOVIAL    Jules Own Version of the International Algorithmic Language
JPL    Jet Propulsion Laboratory
JPL    Jet Propulsion Laboratory [Space]
JRC    Junior Red Cross
JSC    Johnson Space Center
JSC    Johnson Space Center (NASA) [Space]
JSD    Jackson System Development
JSRC    Joint Services Review Committee
JTIDS    Joint Tactical Information Distribution Systems
JV    Junior Varsity
JvNC    John von Neumann (Super Computer) Center
JvNCnet John von Neumann (Super Computer) Center network
K    Kilo- (metric 1000)
K9    canine (K9 corps - army dogs)
KAIST    Korean Advanced Institute of Science and Technology
KAO    Kuiper Airborne Observatory [Space]
KB    KiloByte
KC    King's Counsel (QC when queen reigning)
KC    Knights of Columbus
KD    Kiln Dried
KD    Knocked Down
KDCI    Key Display Call Indicator
KERMIT    Kl-10 Error-free Reciprocal Micro Interconnect over Tty lines
KET    Kentucky Educational Television
KHz    Kilo HertZ (unit of frequency, 1000 cycles per second)
KI    Kiwanis International
KIA    Killed In Action
KIAS    Knot Indicated Air Speed
Km    Kilometers
KO    Knock Out [Boxing, Electric]
KP    Key Pulse [Telephony]
KP    Kitchen Police
KPNO    Kitt Peak National Observatory
KPO    KeyPunch Operator
KQC    King's College London
K&R    Kernighan and Ritchie, the c programming language
KS    King's Scholar
KSC    Kennedy Space Center (NASA) [Space]
KSU    Key System Unit [Telephony]
KTB    Cretaceous-Tertiary Boundary (from German) [Space]
KTS    Key Telephone System [Telephony]
KTU    Key Telephone Unit [Telephony]
KWIC    Key Word In Context
KY    Kentucky
L1    Lagrange Point #1 35,000 Miles above moon [Space]
L2    Lagrange Point #2 40,000 Miles behind moon [Space]
L3    Lagrange Point #3 (?? 35,000 Miles below moon) [Space]
L4    Lagrange Point #4 240,000 mile Earth orbit [Space]
L5    Lagrange Point #5 240,000 mile Earth orbit [Space]
LA    Los Angeles
LA    Louisiana
LA    Low Altitude
LADAR    LAser Detection And Ranging
LAM    Master of Liberal Arts
LAMA    Local Automatic Message Accounting [Telephony]
LAN    Local Apparent Noon
LAN    Local Area Network
LANL    Los Alamos National Laboratory [Space]
LANL    Los Alamos (NM) National Laboratory
LAPB    Link Access Procedure (Balanced)
LAPD    Link Access Procedure (??)
LAPD    Los Angeles (CA, US) Police Department
LAR    Local Acquisition Radar
LaRC    Langley Research Center (NASA) [Space]
LASER    Light Amplification by Stimulated Emission of Radiation
LAT    Local Apparent Time
LATA    Local Access and Transport Area [Telephony]
LAX    Los Angeles International Airport
LB    Light Bomber
LB    pound (LiBra)
LBHS    Long Beach High School
LBL    Lawrence Berkeley (Calif.) Labs
LBS    Pounds
LC    inductor-Capacitor circuit (as in filters, L is symbol inductance)
LCD    Liquid Crystal Display
LCD    Lowest Common Denominator
LCDR    Lieutenant Commander
LCL    Less than Carload Lot [Railroading]
LCL    Lunar Cargo Lander [NASA OEXP]
LCM    Least Common Multiple
LCM    Life Cycle Management
LCS    Laboratory for Computer Science (of MIT)
LCT    Landing Craft Tanks
LD    Long Distance [Telephony]
LDC    Long Distance Carrier [Telephony]
LDEF    Long Duration Exposure Facility [Space, NASA]
LDF    Large Deployable Reflector [Space]
LDL    Low Density Lipoprotein
LDX    Long Distance eXtender [Telephony]
LEAP    Low-power Enhanced At Portable
LEC    Local Exchange Carrier [Telephony]
LED    Light Emitting Diode
LEM    Lunar Excursion Module (a.k.a. LM) (Apollo spacecraft) [Space]
LEO    Low Earth Orbit [Space]
LEP    Large Electron-Positron collider [CERN]
LeRC    Lewis Research Center (NASA) [Space]
LEST    Large Earth-based Solar Telescope [Space]
LF    Low Frequency (30-300KHz)
LFSA    List of Frequently Seen Acronyms (!) [Space]
LGA    Low Gain Antenna [Space]
LGM    Little Green Men [Space]
LH    Left Hand
LH    Liquid Hydrogen (also LH2 or LHX) [Space]
LH    Lower Half
LH    Luteinizing Hormone (same as ISCH)
LHC    Large Hadron Collider [CERN]
LHD    Litterarum Humaniorum Doctor (doctor of human letters)
LHS    Left Hand Side
LI    Long Island
LIFIA    Laboratoire d'Informatique Fondamentale et d'Intelligence Artificielle
LIFO    Last In First Out (see FIFO)
LINC    Laboratory INstrument Computer
LISA    Large Installation Systems Administration (USENIX specific?)
LISP    LISt Processing Language
LIU    Line Interface Unit
LL    Late Latin
LL    Long Lines [Telephony]
LLB    Legum Baccalaureus (bachelor of laws)
LLD    Legum doctor (doctor of laws)
LLN    Line Link Network [Telephony]
LLNL    Lawrence Livermore National Laboratories
LLO    Low Lunar Orbit [Space]
LLOX    Lunar Liquid Oxygen [Space]
LLP    Line Link Pulsing [Telephony]
LM    Life Master (Contract Bridge ranking)
LM    Lunar Module (a.k.a. LEM) (Apollo spacecraft) [Space]
LMC    Large Magellanic Cloud (see SMC)
LMC    Large Magellanic Cloud [Space]
LMOS    Line Maintenance Operations System [Telephony, AT&T]
LN2    Liquid N2 (Nitrogen) [Space]
LNG    Liquified Natural Gas
LOA    Lands of Adventure
LOFT    Launch Operations Flight Test [Space]
LOOPS    Lisp Object Oriented Programming System
LOP    Lines Of Position
LOSF    Lunar Orbit Staging Facility [Space]
LOTS    Low Overhead Timesharing System
LOX    Liquid Oxygen
LOX    Liquid OXygen [Space]
LP    Long Play(ing) (record)
LP    Low Pressure
LPC    Linear Predictive Coding (speech processing)
LPDA    Link Problem Determination Aid
LPF    League for Programming Freedom
LPG    Liquefied Petroleum Gas
LPG    Low Pressure Gas
LPL    Lunar Personnel Lander [NASA OEXP]
LPN    Licensed Practical Nurse
LPP    Licensed Program Products
LPR    Line PrinteR
LPT    Lunar Propellant Tanker [NASA OEXP]
LPV    Lunar Piloted Vehicle [NASA OEXP]
LRB    Liquid Rocket Booster [Space]
LRBM    Long Range Ballistic Missile
LRC    Longitudinal Redundancy Character
LRU    Least Recently Used
LRU    Line Replaceable Unit
LRV    Light Rail Vehicle [Railroading]
LS    Left Side
LS    Letter Signed
LS    Locus Sigilli (place of seal)
LSAP    Logical(?, maybe Link) Service Access Point [OSI, Networking]
LSB    Least Significant Bit; Least Significant Byte
LSB    Lower Side Band
LSC    Lecture Series Committee (of MIT)
LSC    LightSpeed C
LSD    Least Significant Digit
LSD    LySergic acid Diethylamide
LSD    pounds (Libra), shillings (Sestertii), and (old) pence (Denarii)
LSI    Large Scale Integration
LSP    LightSpeed Pascal
LSR    Local Standard of Rest [Space]
LSS    Life Support System
LSS    Loop Switching System
LSSD    Level-Sensitive Scan Detection
LT    Long Ton
LT    Low Tension
LTC    Lieutenant Colonel
LTJG    Lieutenant Junior Grade
LTL    Less than Truckload Lot
LTP    Lunar Transient Phenomenon [Space]
LUG    Local Users Group
LUT    Look-Up Table
LWM    Low-Water Mark
LWT    London Weekend Television [Corporate name]
LZ    Landing Zone
M    Mega- (metric 10^6)
m    meter(s)
m    milli- (metric 1/1000)
M    Miniatures
MA    Massachusetts [US state postal designation]
MAAP    Maintenance And Administration Panel
MAC    an MIT interdepartmental lab (stands for many things) (renamed to LCS)
MAC    Media Access Control
MAC    Medium Access Control
MAC    Military Air Command
MACSYMA project MAC's SYmbolic MAnipulation System
MAD    Mutual Assured Destruction
MADD    Mothers Against Drunk Driving
MAG    Magazine
MAN    Metropolitan Area Network
MAP    Manufacturing Automation Protocol
MAP/TOP Manufacturing Automation Protocol/Technical Office Protocol
MARBI    MAchine Readable form of Bibliographic Information
MARC    MAchine Readable card Catalog
MARS    Multiuser Archival and Retrieval System
MASC    Multiple Award Schedule Contract
MASER    Microwave Amplification by Stimulated Emission of Radiation
MASH    Mobile Army Surgical Hospital
MAST    Multi-Application SOnar Trainer
MAT-CALS    Marine Air Traffic-Control And Landing System
MAU    Math Acceleration Unit
MAU    Media Access Unit
MAU    Medium Access Unit
MB    Manned Base [Space]
MB    MegaByte
MBA    Master Business Administration
MBTA    Massachusetts Bay Transportation Authority
MC    Master of Ceremonies
MCA    Micro Channel Architecture
MCAE    Mechanical Computer Aided Engineering
MCC    Master Control Console
MCC    Microelectronics and Computer technology Corporation
MCC    Mission Control Center [Space]
MCP    Master Control Program
MCP/AS    Master Control Program/Advanced System
MCPO    Master Chief Petty Officer
MCSV    Mars Crew Sortie Vehicle [NASA OEXP]
MD    Doctor of Medicine
MD    Maryland
MD    Maryland [US state postal designation]
MD    Medical Doctor
MD    Months after Date
MDAS    Magnetic Drum Auxiliary Sender
MDC    Metropolitan District Commision (Mass State Agency)
MDE    Modular Design Environment
MDF    Main Distribution Frame [Telephony]
MDRE    Mass Driver Reaction Engine [Space]
MDT    Mean Down Time
ME    Maine
ME    Mechanical Engineer
MECO    Main Engine CutOff [Space, Shuttle]
MEd    Master of EDucation
MERP    Middle-Earth Role Playing
MeV    Million Electron Volts
MF    Medium Frequency (300-3000KHz)
MF    Middle French
MF    Multi-Frequency [Telephony]
MFA    Master Fine Arts
MFA    Museum of Fine Arts [Boston]
MFJ    Modified Final Judgment [Telephony]
MFLOPS    Million FLoating-point OPerations per Second (see also FLOPS)
MFM    Modified Frequency Modulation
MFS    Macintosh File System
MG    Machine Gun
MG    Major General
MG    Military Government
MGH    Massachusetts General Hospital
MGM    Metro-Goldwyn Mayer [Corporate name]
MHD    MagnetoHydroDynamics
MHS    Mail Handling System [ISO]
MHz    Mega HertZ (unit of frequency, 1,000,000 cycles per second)
MI    Michigan
MI    Military Intelligence
MIA    Missing In Action
MIB    Management Information Base
MIDI    Musical Instrument Digital Interface
MIFASS    Marine Integrated Fire And Support System
MILNET    MILitary NETwork
MIM    Morality In Media
MIMD    Multiple Instruction, Multiple Data
MINCE    MINCE Is Not Complete Emacs
MIPS    Million Instructions Per Second
Mir    Peace [Russian]
MIRV    Multiple Independently-Targetable Reentry Vehicle
MIS    Management Information System
MIT    Massachusetts Institute of Technology
ML    Middle Latin
mL    milliliter(s)
MLA    Member of Legislative Assembly (see MPP)
MLD    Minimum Lethal Dose
MLL    Mars Logistics Lander [NASA OEXP]
MLS    Microwave Landing System
MLS    Multi-Level Security
MLV    Medium Lift Vehicle [NASA OEXP]
MM    Maryknoll Missioners
mm    millimeters
MMES    Martin Marietta Energy Systems
MMFS    Manufacturing Message Format Standard
MMH    MonoMethyl Hydrazine [Space]
MMM    see 3M
MMT    Multiple Mirror Telescope [Space]
MMU    Manned Maneuvering Unit [Space]
MMU    Memory Management Unit
MMW    Multi-Mega Watt [Space]
MN    Minnesota
MNA    Member of National Assembly (Quebec)
MNP    Microcom Networking Protocol [Corporate name]
MNRAS    Monthly Notices of the Royal Astronomical Society [Space]
MO    Mail Order
MO    Medical Officer
MO    Missouri
MO    Modus Operandi
MO    Money Order
MOC    Mars Observer Camera (on Mars Observer) [Space]
MOD    Ministry of Defence (UK) (sometimes written MoD)
MOL    Manned Orbiting Laboratory [Space]
MOLA    Mars Observer Laser Altimeter (on Mars Observer) [Space]
MOMA    Museum of Modern Art [New York]
MOMV    Manned Orbital Maneuvering Vehicle [Space]
MOR    Middle-Of-the-Road
MOS    Metal Oxide Semiconductor
MOSFET    Metal Oxide Semiconductor Field Effect Transistor
MOTAS    Member Of The Appropriate Sex
MOTIS    Member Of The Inappropriate Sex
MOTIS    Message-Oriented Text Interchange System
MOTOS    Member of the Opposite Sex
MOTSS    Member of the Same Sex
MOTV    Manned Orbital Transfer Vehicle [Space]
MOU    Memorandum Of Understanding
MOUSE    Minimum Orbital Unmanned Satellite of Earth
MP    Melting Point
MP    Member of Parliament
MP    Metropolitan Police
MP    Military Police(man)
MPC    Minor Planets Circular [Space]
MPE    Mission to Planet Earth [Space]
MPG    Miles Per Gallon
MPH    Miles Per Hour
MPP    Member of Provincial Parliament (Canada; also MLA)
MPR    Mars Pressurized Rover [Space]
MPV    Mars Piloted Vehicle [NASA OEXP]
MPW    Macintosh Programmer's Workshop
MR    Miniatures Rules
MRI    Magnetic Resonance Imaging
MRP    Manufacturing Requirements Planning
MRSR    Mars Rover and Sample Return [Space]
MRSRM    Mars Rover and Sample Return Mission [Space]
MS    ManuScript
MS    Master of Science
MS    Military Science
MS    Motor Ship
MS    Multiple Sclerosis
MSB    Most Significant Bit; Most Significant Byte
MSC    MicroSoft C
MSCP    Mass Storage Control Protocol
MSD    Most Significant Digit
MS-DOS    MicroSoft DOS
MSE    Mobile Subscriber Equipment
MSFC    (George C.) Marshall Space Flight Center (NASA) [Space]
MSFC    Marshall Space Flight Center
MSG    MonoSodium Glutamate
MSH    Marvel Super Heroes
MSL    Mean Sea Level
MSPCA    Massachussetts Society for the Prevention of Cruelty to Animals
MSPE    Mercenaries, Spies & Private Eyes
MSRP    Manufacturer's Suggested Retail Price
MSS    Management Support System
MSS    ManuScriptS
MSS    Mass Storage System
MSS    Maximum Segment Size [TCP/IP] (see also MTU)
MST    Mountain Standard Time
MT    Metric Ton
MT    Mountain Time
MTA    Message Transfer Agent
MTA    Metropolitan Transportation Authority
MTBF    Mean Time Between Failures
MTC    Man Tended Capability [Space]
MTR    Magnetic Tape Recording
MTSO    Mobile Telephone Switching Office [Telephony]
MTTF    Mean Time To Failure
MTTR    Mean Time To Recovery
MTTR    Mean Time To Repair
MTU    Maximum Transfer Unit [Networking] (see also MSS)
MTV    Music TeleVision
MUF    Maximum Usable Frequency (max freq during sunspot activity)
MULTICS MULTiplex Information Computer Services
MUMPS    Mgh Utility MultiProgram System
MUNG    Mung Until No Good (see the hacker's dictionary)
MUX    MUltipleXor
MVA    MegaVolt Ampere
MVS    Multiple Virtual Storage [IBM]
MX    Missile eXperimental
N    North
N    Notice
NA    Narcotics Anonymous
NA    North America
NA    Not Applicable
NAACP    National Association for the Advancement of Colored People
NAAS    North American Automated Systems co.
NAB    National Association of Broadcasters
NABISCO NAtional BIScuit COmpany [Corporate name]
NACCIRN North American Coordinating Committee for Intercontinental Research Networking (see also CCIRN)
NACS    National Advisory Committee on Semiconductors
NAD    Network Access Device
NADGE    NATO Air Defense Ground Environment
NAG    Numerical Algorithms Group
NAGE    National Association of Government Employees
NAK    Negative AcKnowledge
NAM    Name and Address Module [Telephony] (cellular phone changeable ROM)
NAM    National Account Manager [Telephony, AT&T]
NAM    Number Assignment Module [Telephony] (cellular phone changeable ROM)
NANP    North American Numbering Plan
NAPAP    National Acid Precipitation Assessment Program
NAR    Nuclear Acoustic Resonance
NARDAC    NAvy Regional Data Automation Center
NAS    National Academy of Sciences
NAS    National Advanced Systems
NASA    National (US) Aeronautics and Space Administration [Space]
NASDA    NAtional (Japan) Space Development Agency [Space]
NASM    National (US) Air and Space Museum [Space]
NASP    National (US) AeroSpace Plane [Space]
NATO    North Atlantic Treaty Organization
NAVDAC    NAVal Data Automation Command
NAVSWC    NAVal Surface Weapons Center
NB    New Brunswick
NB    Nota Bene
NBA    National (US) Basketball Association
NBC    National (US) Broadcasting Company [Corporate name]
NBFM    NarrowBand Frequency Modulation
NBO    Network Build Out
NBS    National Bureau of Standards (renamed NIST) [US Government]
NBVM    Narrow Band Voice Modulation
NC    No Charge
NC    No Connection
NC    North Carolina
NCA    Network Control Analysis
NCC    National (US) Computer Conference
NCC    National (US) Council of Churches
NCDC    National (US) Climatic Data Center
NCE    New Catholic Edition
NCGA    National (US) Computer Graphics Association
NCI    National (US) Cancer Institute [US Government]
NCIC    National (US) Cartographic Information Center
NCO    Non-Commissioned Officer
NCP    Network Control Program
NCR    National (US?) Cash Register [Corporate name]
NCS    Network Computing System
NCSA    National (US) Center for Supercomputing Applications
NCSC    National (US) Computer Security Center [NSA]
NCTL    National Computer and Telecommunications Laboratory
NCV    No Commercial Value
ND    No Date
ND    North Dakota
NDA    Non-Disclosure Agreement
NDDL    Neutral Data Definition Language
NDE    News Development Environment
NDEA    National (US) Defense Education Act
NDL    Network Database Language
NDP    New Democratic Party (Canada)
NDSL    National (US) Defense Student Loan
NDSL    National (US) Direct Student Loan
NDT    Newfoundland Daylight Time
NDV    NASP Derived Vehicle
NDV    NASP Derived Vehicle [Space]
NE    New England
NE    North East
NEAR    National Electronic Accounting and Reporting system
NEARnet New England Academic and Research Network
NEB    New English Bible
NEC    Nippon Electric Company [Corporate name]
NEI    Not Elsewhere Included
NES    National Energy Strategy
NES    Not Elsewhere Specified
NESC    National Energy Software Center
NET    National (US) Educational Television
NET    NETwork
NET    New England Telephone
NEWS    Network extensible Window System
NEXRAD    NEXt generation weather RADar
NF    No Funds
NFC    National (US) Football Conference
NFFE    National (US) Federation of Federal Employees
NFL    National (US) Football League
NFS    Network File System
NG    National Guard
NG    No Good
NGC    New General Catalog [Space]
NH    New Hampshire
NHI    National Health Insurance
NHL    National (Canada) Hockey League
NHLBI    National Heart, Lung, and Blood Institute (Bethesda, MD)
NIC    Network Information Center ("The NIC" is NIC.DDN.MIL)
NICMOS    Near Infrared Camera / Multi Object Spectrometer (HST upgrade) [Space]
NIFTP    (a file transfer network in the UK)
NIH    National (US) Institutes of Health
NIH    Not Invented Here
NIM    Nuclear Instrumentation Module (an electronic instr. standard)
NIMH    National Institute of Mental Health (Rockville, MD)
NIMS    Near-Infrared Mapping Spectrometer (on Galileo) [Space]
NIR    Near InfraRed [Space]
NIS    Network Information System (formerly yp)
NISO    National Information Standards Organization
NIST    National Institute of Standards and Technology (formerly NBS) [US Government]
NJ    New Jersey
NJB    New Jersey Bell [Telephony]
NL    National League (baseball)
NLM    National Library of Medicine
NLP    Natural Language Processing
NLRB    National Labor Relations Board
NLS    Network License Server
NM    Nautical Mile
NM    New Mexico
NM    Night Message
NM    No Mark; Not Marked
NMOS    N channel Metal Oxide Semiconductor (N-MOS) (see MOS)
NMR    Nuclear Magnetic Resonance
NMS    Network Monitoring Station
NNE    North North East
NNTP    Net News Transfer Protocol
NNW    North North West
NNX    NANP syntax for a three-digit string, N:{2-9}, X:{0-9} [Telephony]
NOA    NSWC Office Automation
NOAA    National Oceanic and Atmospheric Administration [Space, US Government]
NOAO    National (Tucson, AZ, US) Optical Astronomical Observatories [Space]
NOC    Network Operations Center
NORAD    NORth American Defense Command
NORM    Naturally Occuring Radioactive Material
NORML    National Organization for the Reform of Marijuana Laws
NOS    Not Otherwise Specified
NOSC    Naval Ocean Systems Center
NOTIS    Network Operator Trouble Information System
NOW    Negotiable Order for Withdrawal [Banking] (Is this MA or NE specific?)
NOx    Nitrogen Oxides
NP    No Protest
NP    Nondeterministic-Polynomial
NP    Notary Public
NP    Noun Phrase
NPA    Numbering Plan Area (area code) [Telephony]
NPC    Non-Player Character (see PC) [Role-playing]
NPL    National Physical Laboratory (UK)
NPL    Non-Procedural Language
NPN    Negative-Positive-Negative (transistor)
NPN    NonProtein Nitrogen
NPR    National Public Radio
NPR    non-Processor Request [PDP11, UNIBUS]
NQS    Network Queuing System
NRA    National Reconstruction Act (FDR era US)
NRA    National Rifle Association
NRAO    National Radio Astronomical Observatory [Space]
NRC    National Research Council
NRC    Nuclear Regulatory Commission
NRE    Non-Recurring Engineering (as in NRE costs)
NREN    National (US) Research and Education Network
NRL    Naval Research Labs
NRO    National Reconnaissance Office
NRO    National Reconnaissance Organization [Space]
NRZ    Non-Return to Zero
NRZI    Non-Return to Zero Inverted (magnetic tape, 800 bpi)
NS    Neutron Star [Space]
NS    Not Specified
NS    Nova Scotia
NS    Nuclear Ship
NSA    National Security Agency [US Government]
NSAP    Network Service Access Point [OSI, Networking]
NSC    National (US) Security Council [US Government]
NSE    Network Software Environment
NSF    National (US) Science Foundation [US Government]
NSS    Nodal Switching System [NSFnet]
NSSDC    National Space Science Data Center [Space]
NST    Newfoundland Standard Time
NSTS    National Space Transportation System [Space]
NSW    New South Wales (Australia)
NSWC    Naval Surface Warfare Center
NSWC    Naval Surface Weapons Center
NT    New Testament
NT    Newfoundland Time
NT    Northern Territory
NTEU    National Treasury Employees Union
NTIS    National Technical Information Service
NTN    Neutralized Twisted Nematic
NTP    Network Time Protocol [Internet]
NTP    Normal Temperature and Pressure (see STP)
NTSB    National Transportation Safety Board [US Government]
NTSC    National Television Standards Committee
NTSC    Never Twice Same Color
NTT    New Technology Telescope [Space]
NTT    Nippon Telephone & Telegraph
NU    Name Unknown
NURBS    NonUniform Rational B-Spline
NUSC    Naval Underwater Systems Center [US Government]
NV    Nevada
NW    North West
NWNET    NorthWestNet
NWS    National Weather Service
NWT    North West Territories (Australia)
NXX    NANP syntax for a three-digit string, N:{2-9}, X:{0-9} [Telephony]
NY    New York
NYC    New York City
NYNEX    New York and New England (Telephone)
NYPD    New York Police Department
NYSE    New York Stock Exchange
NYSERNet    New York State Educational and Research Network
NZ    New Zealand
NZUSUGI New Zealand Unix System User Group, Inc.
OA    Office Automation
OA    Overeaters Anonymous
OAO    Orbiting Astronomical Observatory [Space]
OAS    Organization of American States
OATS    Office Automation Technology and Services
OBE    Order of the British Empire
OBS    Omni Bearing Selector
OC    Order of Canada
OCDM    Office of Civil Defense and Mobilization
OCI    Out of City Indicator
OCLC    Online Computer Library Center, Inc.
OCLC    Online Computer Library Center (Ohio College Library Catalog)
OCO    Object Code Only
OCR    Optical Character Recognition
OCS    Officer Candidate School
OCST    Office of Commercial Space Transportation [Space]
OD    Doctor of Optometry
OD    Oculus Dexter (right eye)
OD    Officer of the Day
OD    OverDose
ODI    Optical Digital Image
ODISS    Optical Digital Image Storage System
ODT    Octal Debugging Technique
ODT    Online Debugging Technique
OE    Old English
OED    Oxford English Dictionary
OEM    Original Equipment Manufacturer
OEO    Office of Economic Opportunity
OES    Order of the Eastern Star
OEXP    Office of Exploration [NASA]
OF    Old French
OFM    Order of Friars Minor
OFS    Order of Free State
OG    Original Gum
OH    Ohio
OIRA    Office of Information and Regulatory Affairs
OIU    Office Interface Unit
OJT    On the Job Training
OLTP    On-Line Transaction Processing
OMB    Office of Management and Budget [US Government]
OMD    Orchestral Manouevers in the Dark
OMS    Orbital Maneuvering System [Space]
OMV    Orbital Maneuvering Vehicle [Space]
ON    Old Norse
ONC    Open Network Computing
ONI    Office of Naval Intelligence
ONI    Operator Number Identification [Telephony]
ONR    Office of Naval Research
OOP    Object Oriented Programming
OOPART    Out Of Place ARTifact
OOPS    Object-Oriented Programming System
OP    Observation Post
OP    OFFICEPOWER office automation system, trademark of CCI
OP    Order of Preachers
OP    Out of Print
OPEC    Organization of Petroleum Exporting Countries
OPF    Orbiter Processing Facility [Space]
OPM    Office of Personnel Management
OPUS    Obvious Password Utility System (Eugene Spafford <[e-mail]>)
OR    Operating Room
OR    Oregon
OR    Owner's Risk, Own Risk
ORFEUS    Orbiting and Retrievable Far and Extreme Ultraviolet Spectrometer [Space]
ORNL    Oak Ridge National Laboratory
OROM    Optical Read Only Memory
OS    Oculus Sinister (left eye)
OS    Operating System
OS    Ordinary Seaman
OS    Out of Stock
OSB    Order of St. Benedict
OSC    Orbital Sciences Corporation [Space]
OSCAR    Orbiting Satelite Carry Amateur Radio (1st launched 12 Dec 1961)
OSCAR    Orbiting Satellite Carry Amateur Radio (1st launched 12 Dec 1961)
OSCAR    Orbiting Satellite Carrying Amateur Radio [Space]
OSCRL    Operating System Command Response Language
OSD    Office of the Secretary of Defense
OSDIT    Office of Software Development and Information Technology
OSF    Open Software Foundation
OSF    Open Systems Foundation
OSF    Order of St. Francis
OSHA    Occupational Safety and Health Administration [US Government]
OSI    Office of Scientific Integrity [NIH]
OSI    Open Systems Interconnection (per ISO; 7 layer model)
OSI/RM    Open Systems Interconnection/Reference Model
OSME    Open Systems Message Exchange
OSP    Optical Storage Processor
OSPFIGP Open Shortest-Path First Internal Gateway Protocol [Internet]
OSS    Office of Strategic Services (later CIA)
OSS    Office Support System
OSS    Operation Support System [Telephony, AT&T]
OSSA    Office of Space Science and Applications [Space]
OSSE    Oriented Scintillation Spectrometer Experiment (on GRO) [Space]
OSTP    Office of Science and Technology Policy
OSTP    (White House) Office of Science and Technology Policy [US Government]
OT    Old Testament
OT    OverTime
OTA    Office of Technical Assistance
OTA    Office of Technology Assessment
OTA    Optical Telescope Assembly (on HST) [Space]
OTB    Off-Track Betting
OTC    Over The Counter (stocks)
OTF    Open Token Foundation
OTH-B    Over The Horizon - Backscatter (as in radar)
OT&LF    Open Taxi & Limousine Foundation
OTR    On The Rag
OTS    Officers' Training School
OTV    Orbital Transfer Vehicle [Space]
OUTWATS OUTward Wide Area Telephone Service [Telephony]
OV    Orbital Vehicle [Space]
OV    Orbiter Vehicle [Space]
PA    Pennsylvania
PA    Per Annum
PA    Play Aid
PA    Power of Attorney
PA    Press Agent
PA    Private Account
PA    Public Address
PA    Purchasing Agent
PABX    Private Automatic Branch eXchange [Telephony]
PACCOM    Pacific Computer Communications network consortium [Networking]
PACX    Private Automatic Computer eXchange
PAD    Packet Assembler-Disassembler [Networking]
PAH    Polycyclic Aromatic Hydrocarbon
PAL    Phase Alternation Line-rate
PAL    Programmable Array Logic
PAM    Payload Assist Module [Space]
PAM    Pulse Amplification Modulation
PARC    Palo Alto Research Center, xerox
PASS    Personal Access Satellite System [NASA]
PATROL    Program for Administrative Traffic Reports On Line
PBM    Play By Mail game
PBS    Public Broadcasting System
PBX    Private Branch eXchange [Telephony]
PC    Peace Corps
PC    PerCent; PerCentage
PC    Personal Computer (IBM wants you to believe a specific kind)
PC    Player Character (see NPC) [Role-playing]
PC    Post Card
PC    Post Cibum (after meals)
PC    Privileged Character
PC    Privy Council
PC    Program Counter
PC    Progressive Conservative party [Canada]
PC    Providence College
PC/AT    Personal Computer/Advanced Technology
PCB    PolyChlorinated Biphenyl
PCB    Printed Circuit Board
PC-DOS    Personal Computer DOS
PCI    Panel Call Indicator
PCIE    President's Council on Integrity and Efficiency
PCL    Printer Command Language
PCM    Plug-Compatible Mainframe
PCM    Pulse Code Modulation
PCPC    Personal Computers Peripheral Corporation
PCS    Permanent Change of Station
PCTE    Portable Common Tools Environment
PCTS    Posix Conformance Test Suite
PD    Per Diem
PD    Police Department
PD    Potential Difference
PD    Public Domain
PDAD    Proposed Draft ADdendum
PDE    Partial Differential Equation
PDES    Product Data Exchange Specifications
PDF    Program Development Facility
PDL    Page Description Language
PDL    Program Design Language
PDN    Public Data Network
PDP    Plasma Display Panel
PDP    Programmed Data Processor
PDP    Programmed Data Processor [DEC]
PDQ    Pretty Damned Quick
PDS    Premises Distribution System [AT&T]
PDT    Pacific Daylight Time
PE    Phase Encoded
PE    Physical Education
PE    Prince Edward island
PE    Printer's Error
PE    Professional Engineer
PE    Protestant Episcopal
PEI    Prince Edward Island
PEP    Productivity Enhancement Project
PEPE    Pepe Est Presque Emacs
PERL    Pathologically Eclectic Rubbish Lister
PERL    Practical Extraction and Report Language
PEX    Phigs/phigs+ Extension to X
PFC    Plasma Fusion Center [MIT]
PG    Parental Guidance (suggested) [Movie rating]
PGA    Professional Graphics Adapter
PGA    Pure Grain Alcohol
PHA    Pulse Height Analyzer (or Analysis)
PHIGS    Programmers Hierarchical Interactive Graphics System
PHS    Public Health Service
PhysRev Physical Review Journal      - Phys Rev
PI    Principal Investigator
PI    Priority Interrupt
PI    Private Investigator
PIC    Plastic/Polyethelene Insulated Cable [Telephony]
PIC    Position Independant Code
PIF    Paid In Full
PIT    Principal, Interest, and Taxes
PIXEL    PIcture ELement
PLA    Programmable Logic Array
PLATO    Programmed Learning for Automated Teaching Operations (U. Ill., early '70s)
PLC    Programmable Logic Controller
PLCC    Plastic Leaded Chip Carrier
PLL    Phase-Locked Loop
PLM    Programming Language for Microcomputers
PLO    Palestine (sic?) Liberation Organization (?)
PLO    Please Leave On
PLSS    Portable Life Support System [Space]
PM    PayMaster
PM    Police Magistrate
PM    Post Meridiem
PM    Post Meridiem (after noon)
PM    PostMaster
PM    PostMortem
PM    Pressurized Module [Space]
PM    Preventive Maintenance
PM    Prime Minister
PM    Provost Marshal
PMC    Permanently Manned Capability [Space]
PMIRR    Pressure Modulated InfraRed Radiometer (on Mars Observer) [Space]
PMO    Prime Minister's Office
PMOS    P channel Metal Oxide Semiconductor (P-MOS) (see MOS)
PMS    PreMenstrual Syndrome
PMT    PhotoMultiplier Tube
PM/X    Presentation Manager for X windows
PN    Promissory Note
PNP    Positive-Negative-Positive (transistor)
PO    Petty Officer
PO    Post Office
PO    Postal Order
PO    Purchase Order
POC    Port Of Call
POD    Pay On Delivery
POE    Port Of Embarkation
POE    Port Of Entry
POGO    Polar Orbiting Geophysical Observatory
POM    Phase Of Moon
POP    Point of Presence [Telephony]
POP    Post Office Protocol [Networking] (esp. TCP/IP)
POPS    Paperless Order Processing System
POR    Price On Request
POS    Point Of Sale
POS    Professional Operating System [DEC]
POSI    Promoting conference for OSI
POSIX    Portable Operating System for unIX
POSIX    Portable Operating System Interface
POTS    Plain Old Telephone Service [Telephony]
POTV    Personnel Orbit Transfer Vehicle [Space]
POV    Point Of View
POW    Prisoner Of War
PP    Parcel Post
PP    Past Participle
PP    Post Pay (payphone) [Telephony]
PP    Primary Point
PPB    Parts Per Billion
PPC    Pour Prendre Conge' (to take leave)
PPCS    Person to Person, Collect, Special [Telephony]
PPM    Parts Per Million
PPN    Parameterized Post-Newtonian formalism for general relativity
PPN    Project Programmer Number
PPP    Point-to-Point Protocol (successor to SLIP (q.v.))
pps    Packets per Second
PPS    PostPostScriptum
PPT    Parts Per Trillion
PPT    Pulse Pair Timing
PPT    Punched Paper Tape
PQ    Province of Quebec
PR    PayRoll
PR    Public Relations
PR    Puerto Rico
PRC    Planning Research Corporation
PREPnet Pennsylvania Research & Economic Partnership Network
PRI    Primary Rate Interface (ISDN) [Telephony]
PRN    pro re nata [Medicine] (as needed?)
PROFS    PRofessional OFfice System [IBM]
PROM    Programmable Read-Only Memory
PS    PicoSecond
PS    PostScript
PS    PostScriptum
PS    Power Steering
PS    Power Supply
PS    Proposed Standard
PS    Public School
PSA    Problem Statement Analyzer
PSC    Pittsburgh Supercomputer Center
PSC    Polar Stratospheric Clouds
PSDN    Public Switched Data Network [Telephony]
PSDS    Public Switched Digital Service [Telephony, AT&T]
PSE    Programming Support Environment
PSF    Point Spread Function [Space]
PSG    Platoon SerGeant
PSI    Performance Systems International [Corporate name, Networking]
PSI    Power Systems, Incorporated [Corporate name, Model Railroading]
PSK    Phase Shift Keying
PSL    Problem Statement Language
PSN    Packet Switch Node [ARPANET/MILNET] (replaced IMP)
PSR    Product Specific Realizations
PSR    PulSaR [Space]
PSS    (unknown to me, but something in the UK environment)
PST    Pacific Standard Time
PSTN    Public Switched Telephone Network
PT    Pacific Time
PT    Patrol Torpedo (as in PT boat)
PT    Physical Therapy
PT    Physical Training
PTA    Parent-Teacher Association
PTD    Parallel Transfer Disk
PTL    Praise The Lord (ministry)
PTN    Plant Test Number [Telephony] (actual number assigned for 800 service)
PTO    Patent and Trademark Office
PTO    Please Turn Over
PTO    Power Take-Off
PTT    Post, Telephone and Telegraph administration
PTV    Passenger Transport Vehicle [Space]
PUC    Public Utilities Commision
PV    Photovoltaic [Space]
PVC    Permanent Virtual Circuit (see also VC)
PVC    Poly-Vinyl Chloride
PVO    Pioneer Venus Orbiter [Space]
PW    Prisoner of War (usually POW)
PWG    Permanent Working Group
PX    Post eXchange (see BX)
QAM    Quadrature Amplitude Modulation
QC    Quality Control
QC    Queen's Counsel (KC when queen reigning)
QD    Quaque Die (daily) [Medicine]
QDA    Quantity Discount Agreement
QED    Quod Erat Demonstrandum (which was to be demonstrated) [Latin]
QEF    Quod Erat Faciendum (which was to be done) [Latin]
QEI    Quod Erat Inveniendum (which was to be found out) [Latin]
QET    Quantum Effect Transistor
QIC    Quarter-Inch Cartridge
QID    Quater In Die (four times a day) [Medicine]
QLI    Query Language Interpreter
QM    QuarterMaster
QMC    QuarterMaster Corps
QMF    Query Management Facility
QMG    QuarterMaster General
QMS    Quality Micro Systems [Corporate name]
QNS    Quantity Not Sufficient
QSO    Quasi-Stellar Object [Space]
q.v.    ???? (Latin(?): which see)
QWERTY    first six keys from left on top alphabetic row of standard keyboard
R    Restricted [Movie rating]
R    Rolemaster
RA    Regular Army
RA    Research Assistant
RA    Royal Academy
RAAF    Royal Australian Air Force
RACE    Random Access Card Equipment
RACEP    Random Access and Correlation for Extended Performance
RAD    Radiation Absorbed Dose
RAD    Rapid Access Disk
RADAR    RAdio Detection And Ranging
RADM    Rear ADMiral
RAF    Royal Air Force
RAM    Random Access Memory (R/W)
RAM    Red Academicia de Mexico (Mexican Academic Network)
RARDE    Royal Armaments Research and Development Establishment
RARE    R\'eseaux Associ\'es pour la Recherche Europ\'eenne (the European Organization of Research Networks)
RAS    Reliability, Availability, and Serviceability
RASC    Residence Account Service Center
RATS    Radio Amateur Telecommunications Society
R&B    Rhythm and Blues (commonly R and B)
RBC    Red Blood Count
RBI    Runs Batted In
RBOC    Regional Bell Operating Company
RC    Red Cross
RC    Regional Center
RC    Resistor-Capacitor circuit (as in filters)
RC    Roman Catholic
RCA    Radio Corporation of America [Corporate name]
RCAF    Royal Canadian Air Force
RCAS    Reserve Component Automation System
RCC    Radio Common Carrier
RCMP    Royal Canadian Mounted Police
RCS    Reaction Control System [Space]
R&D    Research and Development (commonly R and D)
RD    Rural Delivery
RDA    Remote Data Access
RDBMS    Relational DataBase Management System
RDF    Radio Direction Finding
REA    Rail Express Agency
RECON    Reconnaissance
REM    Rapid Eye Movement
REO    R. E. Olds
REO    Removable, Erasable, Optical
RETMA    Radio {something(equipment?)?} {something?} Manufacturers' Association (????)
REXX    Restructured EXtended eXecutor
RF    Radio Frequency
RF    Radio Frequency [Space]
RFC    Request For Comments (ala ARPA Internet)
RFD    Rehoboth (MA) Fire Department
RFD    Rural Free Delivery
RFI    Radio Frequency Interference
RFI    Radio Frequency Interference [Space]
RFP    Request for Proposal
RFQ    Request for Quote
RFS    Remote File System
RGB    Red Green Blue
RGP    Raster Graphics Processor
RH    Right Hand
RHC    Regional (Bell) Holding Company
RHS    Right Hand Side
RI    Rhode Island
RIACS    Research Institute for Advanced Computer Science (NASA)
RIACS    Research Institute for Advanced Computer Science [Space]
RIAS    Radio In the American Sector, berlin
RIF    Reading Is Fundamental
RIF    Reduction In Force
RILM    Repertoire International de Literature Musicale
RIP    Rest In Peace (or Requiescat In Pace : latin)
RIP    Routing Interchange Protocol
RIPE    R\'eseaux IP Europ\'eenne (European IP Networks) (of RARE, q.v.)
RISC    Reduced Instruction Set Computer
RITA    Recognition of Information Technology Achievement award
RJE    Remote Job Entry
RLC    Resistor Inductor Capacitor
RLG    Research Libraries Group
RLIN    Research Libraries Information Network (run by RLG (q.v.))
RLL    Run Length Limited
RMA    Radio Manufacturers' Association
RMA    Return Materials Authorization
RMATS    Remote Maintenance Administration and Traffic System [Telephony]
RMS    Remote Manipulator System [Space]
RMS    Richard M. Stallman
RMS    Root Mean Square
RMS    Royal Mail Ship
RN    Registered Nurse
RN    Royal Navy
RNA    RiboNucleic Acid
RNGC    Revised New General Catalog [Space]
RNZAF    Royal New Zealand Air Force
ROFF    Run-OFF
ROG    Receipt Of Goods
ROM    Range Of Motion [Medicine]
ROM    Read-Only Memory
ROM    Rupture Of Membrane (as in birth)
ROSAT    ROentgen SATellite [Space]
ROSE    RATS (q.v.) Open Systems Environment
ROSE    Remote Operations Service Entity (per ISO/CCITT layer 7)
ROTC    Reserve Officers' Training Corps
ROTS    Rotary Out Trunks Selectors
ROYGBIV Red, Orange, Yellow, Green, Blue, Indigo, Violet
RPC    Remote Procedure Call
RPG    RePort Generator
RPG    Role Playing Game
RPI    Rensselaer Polytechnic Institute
RPM    Revolutions Per Minute
RPN    Reverse Polish Notation
RPO    Railway Post Office
RPS    Revolutions Per Second
RPV    Remotely Piloted Vehicle
RQ    RuneQuest
RR    RailRoad
RR    Route Relay
RR    Rural Route
RRO    Rate and Route Operator [Telephony]
RS    Recommended Standard (EIA)
RS    Recording Secretary
RS    Revised Status
RS    Right Side
RS    Royal Society
RSCS    Remote Spooling Communications Subsystem
RSFSR    Russian Soviet Federated Socialist Republic
RSN    Real Soon Now
RSU    Remote Switching Unit
RSV    Revised Standard Edition
RSVP    Repondez S'il Vous Plait (please reply)
RSWC    Right Side up With Care
RT    RadioTelephone
RT    RealTime
RTA    Remote Trunk Arrangement [Telephony]
RTAC    Regional Technical Assistance Center [Telephony]
RTF    Rich Text Format
RTFM    Read The @!# Manual
RTFM    Read The F***ing Manual
RTG    Radioisotope Thermoelectric Generator
RTG    Radioisotope Thermoelectric Generator [Space]
RTLS    Return To Launch Site (Shuttle abort mode) [NASA, Shuttle, Space]
RTR    Ready to Run [Model Railroading]
RTR    Reel-To-Reel
RTS    Request To Send (EIA RS-232-C)
RTTY    Radio Teletype
RU    Receive Unit
RVD    Remote Virtual Disk [MIT]
RW    Right Worshipful
RW    Right Worthy
RX    Receive
Ry    Railway
S    South
S    Supplement
SA    Salvation Army
SA    Seaman Apprentice
SA    Service Assistant
SA    Sex Appeal
SA    Sine Anno (without date)
SA    South Africa
SA    South America
SA    Subject to Approval
SAA    South Atlantic Anomaly
SAA    South Atlantic Anomaly [Space]
SAA    Systems Application Architecture
SAC    Special Area Code [Telephony] (represent services, not places)
SAC    Strategic Air Command (see TAC)
SAC    Strategic Air Command [US military]
SADD    Students Against Drunk Driving
SAFENET Survivable Adaptable Fiberoptic Embedded Network [US Navy]
SAM    Surface to Air Missile
SAM    Surface-to-Air Missile
SAMA    Step-by-step Automatic Message Accounting [Telephony]
SAMPEX    Solar Anomalous and Magnetospheric Particle EXplorer [Space]
SAMTO    Space And Missile Test Organization [Space]
SAO    Smithsonian Astrophysical Observatory [Space]
SAP    Second Audio Program
SAP    Service Access Point [OSI, Networking]
SAR    Search And Rescue
SAR    Synthetic Aperture Radar
SARA    Satellite pour Astronomie Radio Amateur [Space]
SARA    Stichting Academisch Rekencentrum Amsterdam (Amsterdam Universities Computing Center)
SAREX    Search and Rescue Exercise [Space]
SAREX    Shuttle Amateur Radio Experiment [Space]
SARTS    Switched Access Remote Test System
SAS    Small Astronomy Satellite
SAS    Space Activity Suit [Space]
SASE    Self-Addressed Stamped Envelope
SASI    Shugart Associates Systems Interface
SAT    Satellite [Space]
SAW    Surface Acoustic Wave
SBA    Small Business Administration
SC    Secondary Channel
SC    Sectional Center
S&C    Skull & Crossbones
SC    South Carolina
S/C    SpaceCraft [Space]
SC    SubCommittee
SCA    Shuttle Carrier Aircraft [Space]
SCAD    Subsonic Cruise Armed Decoy
SCADC    Standard Central Air Data Computer
SCAME    SCreen oriented Anti-Misery Editor
SCAMP    Single-Chip A-series Mainframe Processor
SCAN    Switched Circuit Automatic Network
SCC    Specialized Common Carriers
SCC    Switching Control Center
SCCS    Source Code Control System
SCE    Signal Conversion Equipment
SCE    Structure Chart Editor
SCI    SpaceCraft Incorporated
SCIFI    SCIence FIction (often used pejoratively of what really isn't)
SCO    Santa Cruz Operation
SCOOPS    SCheme Object Oriented Programming System
SCOTS    Surveilance and Control Of Transmission Systems
SCSI    Small Computer Systems Interface
SCT    Schmidt-Cassegrain Telescope [Space]
SCUBA    Self Contained Underwater Breathing Apparatus
SCUD    Subsonic Cruise Unarmed Decoy
SD    South Dakota
SDB    Source(?) DeBugger
SDI    Standard Disk Interconnect [DEC]
SDI    Strategic Defense Initiative [Space, US Government]
SDIO    Strategic Defense Initiative Organization [Space, US Government]
SDLC    Synchronous Data Link Control [IBM]
SDM    Sub-rate Data Multiplexer
SDN    Software Defined Network [Telephony, AT&T]
SDN    System Development Network (Korea)
SDO    Staff Duty Officer
SDSC    San Diego Supercomputer Center
SDV    Shuttle Derived Vehicle [Space]
SE    Service Engineer (see also CE, FE)
SE    South East
SEATO    SouthEast Asia Treaty Organization
SEC    Security Exchange Commission
SECNAV    SECretary of the NAVy
SED    Stream EDitor
SEI    Software Engineering Institute (Carnegie Mellon)
SEI    Space Exploration Initiative [Space]
SEL    Software Engineering Laboratory
SEM    Scanning Electron Microscope
SEST    Swedish-European Submillimeter Telescope [Space]
SETI    Search for Extra Terrestrial Intelligence [Space]
SETI    Search for ExtraTerrestrial Intelligence [Space]
SF    San Francisco
SF    Science Fiction; Speculative Fiction
SF    Standard Form
SF    Star Frontiers
SFRPG    Science Fiction Role Playing Game
SG    StarGuard
SG    SubGroup
SGML    Standard Generalized Markup Language
SHAPE    Supreme Headquarters Allied Powers Europe
SHAR    SHell ARchiver
SHCD    Sherlock Holmes Consulting Detective
SHF    Super High Frequency (3-30GHz)
SHRPG    Super Hero Role Playing Game
SI    Staten Island
SIAM    Society for Industrial and Applied Mathematics
SID    Sudden Ionospheric Disturbance [Space]
SIG    Special Interest Group
SIGCAT    Special Interest Group for Cd-rom Applications Technology
SIMD    Single Instruction, Multiple Data
SIMM    Single In-line Memory Module
SIMM    System Integrated Memory Module
SINE    SINE is not EINE
SIPS    Satellite Imagery Processing System
SIR    Shuttle Imaging Radar [Space]
SIRTF    Space (formerly Shuttle) InfraRed Telescope Facility [Space]
SIRTF    Space Infrared Telescope Facility [Space]
SIS    Strategic Information System
SISCOM    Satellite Information System COMpany
SITA    Societe Internationale Telecommunications Aeronautiques
SJ    Society of Jesus
Skyhook Surface to space "elevator" transportation system [Space]
SL    Salvage Loss
SL    Space Launch [Space]
SL    SpaceLab [Space]
SLA    Special Libraries Association
SLA    Synchronous Line Adapter
SLAC    Stanford Linear Accelerator Center
SLAN    Sine Loco, Anno, (vel) Nomine (without place, year, or name)
SLAR    Side Looking Airborne Radar
SLAR    Side-Looking Airborne Radar [Space]
SLBM    Submarine Launched Ballistic Missiles
SLC    Space Launch Complex [Space]
SLC    Subscriber Loop Carrier [Telephony]
SLDC    Synchronous Data Link Control
SLIP    Serial Line Internet Protocol
SLIP    Serial Line IP (sometimes SL/IP) (see also PPP)
SLP    Super Long Play (VHS VCR)
SLS    Space(lab) Life Sciences [Space]
SM    Service Mark
SMA    Sergeant Major of the Army
SMA    Spectrum Manufacturers Association
SMC    Small Magellanic Cloud (see LMC)
SMC    Small Magellanic Cloud [Space]
SMD    Storage Module Device (interface standard for disk drives)
SMD    Surface Mounted Devices
SMDR    Station Message Detail Recording [Telephony]
SMDS    Switched Multi-megabit Data Service [Telephony, Networking]
SME    Solar Mesosphere Explorer [Space]
SMEGMA    Sophisticated Modern Editor with Gloriously Magnificent Abilities
SMERSH    Abbr. of Russian phrase meaning "Death to the spies."
SMEX    SMall EXplorers [Space]
SMILS    Sonobuoy Missile Impact Location System
SMM    Solar Maximum Mission (satellite 1980-1989) [Space]
SMTP    Simple Mail Transfer Protocol
SMU    Southeastern Massachusetts University
SMU    Southern Methodist University
SN    Science News [Periodical]
SN    Serial Number
SN    Super Nova
SN    SuperNova (e.g., SN1987A) [Space]
SNA    Systems Network Architecture [IBM]
SNADS    SNA Distribution Services
SNAFU    Situation Normal -- All Fouled Up (also more profane versions)
SNAP    Shipboard Non-tactical Automated data Processing program
SNAP    Sub Network Access Protocol [OSI, Networking]
SNCF    Societe National des Chemins de Fer (French National Railways)
SNF    Server-Natural Format
SNMP    Simple Network Management Protocol [TCP/IP]
SNOBOL    StriNg Oriented symbOLic Language
SNPA    SubNetwork Point of Attachment
SNR    Signal to Noise Ratio
SNR    Signal to Noise Ratio [Space]
SNR    SuperNova Remnant [Space]
SNU    Solar Neutrino Units [Space]
SO    Seller's Option
SO    Significant Other
SO    Space Opera
SO    Strike Out
SOAP    Symbolic Optimizing Assembler Program
SOFIA    Stratospheric Observatory For Infrared Astronomy [Space]
SOH    Start Of Header, ASCII control character (dec=01,control-A)
SOHIO    Standard Oil of oHIO [Corporate name]
SOHO    SOlar Heliospheric Observatory [Space]
SOL    Short on Landing (or, colloquially, Shit Out of Luck)
SONAR    SOund Detection And Ranging
SONET    Synchronous Optical Network [Telephony]
SOP    Standard Operating Procedure
SOS    Save Our Souls (International standard distress call, Morse ...---...)
SOS    Silicon On Sapphire
SOS    Son of Stopgap (editor) [DEC]
SP    Shore Patrol
SP    Short Play (VHS VCR)
SP    Southern Pacific [Corporate name, Railroading]
SP    Stack Pointer
SP    Star Patrol
SPA    Software Publishers Association
SPAG    Standards Promotion and Applications Group
SPAN    Space Physics and Analysis Network [NASA] (DECnet)
SPAN    Space Physics and Analysis Network [Space]
SPAR    Stock Points Adp Replacement
SPARC    Scalable Processor ARChitecture
SPARC    Standards, Planning, And Requirements Committee
SPAWAR    naval SPAce and WARfare command
SPC    Software Productivity Consortium
SPCA    Society for the Prevention of Cruelty to Animals
SPCC    Society for the Prevention of Cruelty to Children
SPDM    Special Purpose Dextrous Manipulator [Space]
SPEC    Systems Performance Evaluation Cooperative
SPITBOL SPeedy ImplemenTation of snoBOL
SPNI    Society for the Protection of Nature in Israel
SPOT    Systeme Probatoire pour l'Observation de la Terre [Space]
SPS    Solar Power Satellite [Space]
SPUR    Systech Pluraxial Unplug Repeater
SQIID    Simultaneous Quad Infrared Imaging Device (at NOAO)
SQL    Structured Query Language
SQUID    Superconducting QUantum Interference Device
SRAM    Short Range Attack Missile
SRAM    Static RAM
SRB    Solid (fuel) Rocket Booster [Space]
SRG    Short and Ring Ground (test) [Telephony]
SRI    Stanford Research Institute
SRM    Solid Rocket Motor [Space]
SRO    Standing Room Only
SS7    Signalling System #7 [Telephony]
SSA    Social Security Administration [US Government]
SSB    Single Side Band
SSC    Superconducting Super Collider
SSE    South-SouthEast
SSF    Space Station Fred (er, Freedom) [Space]
SSF    Space Station Freedom [NASA, Space]
SSFF    Showcase Software Factory of the Future
SSG    Staff SerGeant
SSI    Small Scale Integration
SSI    Solid-State Imager (on Galileo) [Space]
SSI    Space Services Incorporated [Corporate name, Space]
SSI    Space Studies Institute [Space]
SSI    Supplemental Security Income
SSME    Space Shuttle Main Engine [Space]
SSPF    Space Station Processing Facility [Space]
SSPS    Satellite Solar Power Station [Space]
SSR    Secondary Surveillance Radar
SSR    Soviet Socialist Republic
SSRMS    Space Station Remote Manipulator System [Space]
SST    Spectroscopic Survey Telescope [Space]
SST    SuperSonic Transport [Space]
SSTO    Single Stage To Orbit [Space]
SSTV    Slow Scan TeleVision
SSW    South-SouthWest
ST    Short Ton
STARS    Software Technology for Adaptable, Reliable Systems
STD    Sacrae Theologiae Doctor (doctor of sacred theology)
STD    Sexually Transmitted Disease (replaces VD)
STD    State Transition Diagram
STD    Subscriber Trunk Dialing (British, and elsewhere; equiv. DDD in USA)
STI    Standard Tape Interconnect [DEC]
STILO    Scientific and Technical Intelligence Liaison Office
STIS    Space Telescope Imaging Spectrometer (to replace FOC and GHRS) [Space]
STL    St. Louis (airport designation)
STN    SuperTwisted Nematic
STOL    Short TakeOff and Landing
STP    Shielded Twisted Pair [Telecom, Networking]
STP    Software Through Pictures
STP    Standard Temperature and Pressure (see NTP)
STRPG    Star Trek:  The Role-Playing Game
STS    Space Transportation System (space shuttle) [NASA]
STScI    Space Telescope Science Institute [Space]
STV    Single Transferable Vote
STV    Space Transfer Vehicle [Space]
SUM    Symantec Utilities for Macintosh
SUN    Stanford University Network
SUN    SUN MicroSystems Computer (not an Acronym) [Corporate name]
SUNOCO    SUN Oil COmpany [Corporate name]
SUNY    State University of New York
SURAnet Southeastern Universities Research Association Network
SVID    System V Interface Definition
SW    South West
SW    SuperWorld
SWAS    Submillimeter Wave Astronomy Satellite [Space]
SWBT    South Western Bell Telephone [Telephony]
SWF    ShortWave Fading [Space]
SWIFT    Society for Worldwide Interbank Financial Communications
SWS    Scientific Workstation Support
SXS    Step by Step switching [Telephony]
T    Traveler
T1    1.544Mbps [Telephony], one of the basic signalling systems 24x64Kb
T3    45Mbps (eq 28 T1 channels) [Telephony]
TA    Teaching Assistant
TAC    Tactical Air Command (see SAC)
TAC    Terminal Access Controller [ARPANET/MILNET] (replaced TIP)
TACACS    Terminal Access Controller Access Control System [ARPANET/MILNET]
TACCS    Tactical Army Combat service support Computer System
TAE    Transportable Applications Environment
TAL    Trans-Atlantic Abort Landing [NASA, Shuttle]
TAL    Transatlantic Abort Landing (Shuttle abort plan) [Space]
TANSTAAFL    There Ain't No Such Thing As A Free Lunch
TAR    Tape ARchiver
TASI    Time Assign{ment,ed} Speech Interpolation [Telephony]
TAU    Thousand Astronomical Units [Space]
TB    TuBerculosis
TBA    To Be Announced
TBD    To Be Determined
TBD    To Be Done
TC    Teachers College
TCA    Terminal Controlled Airspace
TCP    Transmission Control Protocol
TCP/IP    Transmission Control Protocol/Internet Protocol
TCS    Thermal Control System [Space]
TCSEC    Trusted Computer System Evaluation Criteria (orange book)
TCT    To Challenge Tomorrow
TD    Tardive Dyskinesia
TD    TouchDown
TD    Treasury Department
TDCC    Transportation Data Coordinating Committee
TDE    Transition Diagram Editor
TDI    Trusted Database Interpretation
TDM    Time-Division Multiplexer
TDR    Time Domain Reflectometer
TDRS    Tracking and Data Relay Satellite [Space]
TDRSS    Tracking and Data Relay Satellite System [Space]
TDY    Temporary DutY
TECO    Tape Editor and COrrector
TECO    Text Editor and COrrector
TEFLON    polyTEtraFLuOrethyleNe
TES    Thermal Emission Spectrometer (on Mars Observer) [Space]
TFP    Tops Filing Protocol
TFS    Translucent File System
TFT    The Fantasy Trip
TFT    Thin Film Transistor
TG    Thieves' Guild
TGV    Tres Grande Vitesse (French, Very High Speed) [Railroading]
TGV    Two Guys and a VAX (humorous variant) [Corporate name]
THIEF    THief Isn't Even Fine
THIEF    This Here Isn't Even Fine
THOR    Tandy High-intensity Optical Recording
TI    Texas Instruments
TIA    Thanks In Advance [Net jargon]
TIA    Transient Ischemic Attack
TIC    TermInfo Compiler
TID    Ter In Die (three times a day)
TID    Transaction ID
TIFF    Tag Image File Format
TIP    Terminal Interface Processor [ARPANET/MILNET] (replaced by TAC)
TIS    Trusted Information Systems [Corporate name]
TISN    Tokyo International Science Network (Japan)
TKO    Technical Knock Out [Boxing]
TL    Total Loss
TLA    Three Letter Acronym
TLC    Tender Loving Care
TLI    Transort-Level Interface
TM    TradeMark
TMA    Tycho Magnetic Anomaly (movie 2001)
TMAC    Treasury department's Multiuser Acquisition Contract
TMIS    Telecommunications Management Information System
TMO    Telephone Money Order
TMP    The Morrow Project
TMRC    Tech Model Railroad Club [MIT]
TMRC    Transportation Modeling Research Center (TMRC {above} alter ego)
TN    Tennessee
TN    Twisted Nematic
TNC    Threaded Neill Concelman (connector) [Electronics] (see also BNC)
TNF    Tumor Necrosis Factor [Biology, Medicine]
TNP    Tech Nickel Plate (RR) [TMRC]
TNT    TriNitro Toluene
TO    Telegraph Office
TO    Turn Over
TODS    Transactions on Database Systems (ACM)
TOMS    Total Ozone Mapping Spectrometer [Space]
TOMS    Transactions on Mathematical Software (ACM)
TOOIS    Transactions on Office Information Systems (ACM)
TOP    Technical Office Protocol
TOPLAS    Transactions on Programming Languages and Systems (ACM)
TOPS    Traffic Operator Position System [Telephony]
TOPSMP    Traffic Operator Position System Multipurpose [Telephony]
TORES    Text ORiented Editing System
TOS    Transfer Orbit Stage [Space]
TOW    Tube launched, Optically tracked, and Wire guided
TOY    Time Of Year (clock)
TP    Transaction Processing
TP    Transport Protocol (ISO/CCITT Transport Services (TP0-TP4); like TCP)
TP4    Transport Protocol, class 4 [ISO]
TPC    The Phone Company (from classic movie: _The President's Analyst_)
TPI    Tracks Per Inch
TPO    Traveling Post Office
TPP    TetraarylPorPhyrin
TPS    Technical Publishing Software
TPS    TeleProcessing Services
TPS    Thermal Protection System [Space]
TR    Tech Report (at least at LCS (q.v.), maybe others)
TR    Technical Reference [Bell, Telephony]
TRG    Tip and Ring Ground (test) [Telephony]
TROFF    Text RunOFF, text formatter
TRUSIX    TRUSted unIX
TRW    Thompson, Ramo, and Woolridge
TS    Top Secret
TSAP    Transport Service Access Point [OSI, Networking]
TSD    Total System Design
TSP    Teleprocessing Services Program
TSP    Thrift Savings Plan
TSP    Time Synchronization Protocol
TSP    TriSodium Phosphate
TSR    TSR (Fortune 500 Company that manufactures Dungeons & Dragons)
TSS    Tethered Satellite System [Space]
TSTO    Two Stage to Orbit [Space]
T&T    Tunnels & Trolls
TTFN    Tah Tah, For Now
TTL    Transistor Transistor Logic
TTMA    Tennessee Tech Microcomputer Association
TTU    Tennessee Technological University
TTY    TeleTYpe
TUNIS    Toronto UNIversity System
TV    TeleVision
TVA    Tennessee Valley Authority
TW    Thieves' World
TWA    Trans World Airlines [Corporate name]
TWB    Terrestrial WideBand [Networking, DARPA]
TWIMC    To Whom It May Concern
TWT    Traveling Wave Tube
TWX    TeletypeWriter eXchange
TX    Texas
Tx    Transmit
u    (representing the greek mu) - micro
U    Universe
UA    United Artists
UAR    United Arab Republic
UAR    User Action Routine
UARS    Upper Atmosphere Research Satellite [Space]
UART    Universal Asynchronous Receiver Transmitter
UBA    UniBus Adapter [DEC]
UBC    Universal Bibliographic Control
UBC    University of British Columbia
UBM    Unpressurized Berthing Mechanism [Space]
UCAR    University Corporation for Atmospheric Research
UCB    University of California at Berkeley
UCD    Uniform Call Distributor [Telephony]
UCD    University of California at Davis
UCI    University of California at Irvine
UCL    University College London
UCLA    University of California at Los Angeles
UCR    University of California at Riverside
UCSB    University of California at Santa Barbara
UCSC    University of California at Santa Cruz
UCSD    University of California at San Diego
UCSF    University of California at San Francisco
UDB    Unified DataBase
UDMH    Unsymmetrical DiMethyl Hydrazine [Space]
UDP    User Datagram Protocol
UEC    User Environment Component
UFO    Unidentified Flying Object [Space]
UGC    Uppsala General Catalog [Space]
UH    Upper Half
UHF    Ultra High Frequency (300-3000MHz)
UID    Unique IDentifier
UID    User IDentification [UNIX]
UIMS    User Interface Management System
UIT    Ultraviolet Imaging Telescope (Astro package) [Space]
UIUC    University of Illinois at Urbana-Champaign
UK    United Kingdom
UKST    United Kingdom Schmidt Telescope [Space]
UL    Underwriters Laboratory
ULANA    Unified Local-Area Network Architecture
UMOC    Ugliest Man On Campus [MIT]
UMT    Universal Military Training
UN    United Nations
UNESCO    United Nations Educational, Scientific, & Cultural Organization
UNICEF    United Nations International Children's Emergency Fund (now United Nat. Child. Fund)
UNICS    UNiplex Information Computer Services
UNIX    Not an acronym at all.    Was a joke on MIT's MULTICS.
UNMA    Unified Network Management Architecture [AT&T]
UNO    United Nations Organization
UP    Union Pacific [Railroading, Corporate name]
UPC    Universal Product Code
UPI    United Press International
UPI    United Press International [Corporate name]
UPS    Uninterruptible Power Supply
UPS    United Parcel Service [Corporate name]
UR    University of Rochester
URI    University of Rhode Island
US    United States (of America)
USA    Union of South Africa
USA    United States Army
USA    United States of America
USAF    United States Air Force
USAFA    United States Air Force Academy (in Colorado Springs)
USAN    University Satellite Network
USB    Upper Side Band
USC    University of Southern California
USCG    United States Coast Guard
USDA    United States Department of Agriculture
USES    United States Employment Service
USFL    United States Football League
USGS    United States Geological Survey
USIA    United States Information Agency
USM    United States Mail
USMC    United States Marine Corps
USMP    United States Microgravity Payload [Space]
USN    United States Navy
USO    United Service Organizations
USO    Unix Software Operation
USP    United States Pharmacopeia
USPS    United States Postal Service
USR    User Service Routines
USS    United States Ship
USSR    Union of Soviet Socialist Republics
USSS    User Services and Systems Support
USW    Und So Weiter
UT    Universal Time (a.k.a. GMT, UTC, or Zulu Time)
UT    University of Tennessee
UT    University of Texas
UT    UTah
UTC    Coordinated Universal Time (a.k.a. UT)
UTC    Universal Coordinated Time (a.k.a. UT)
UTnet    University of Texas Network
UTP    Unshielded Twisted Pair [Telecom, Networking]
UUCP    UNIX-to-UNIX Copy Program
UUG    Unix User Group
UV    UltraViolet
UVS    UltraViolet Spectrometer
UW    UnderWriter
UW    Univ of Wisconsin
VA    Veterans Administration
VA    Virginia
VAB    Vehicle Assembly Building (formerly Vertical Assembly Building) [Space]
VAFB    Vandenberg Air Force Base [Space]
VAN    Value Added Network (e.g. Tymnet, Telenet, etc)
VANS    Value-Added Network Services
VAR    Value Added Remarketer (reseller)
VASI    Visual Approach Slope Indicator
VAT    Value Added Tax
VAX    Virtual Address eXtended
VAXBI    VAX Bus Interconnect
VC    Viet Cong
VC    Virtual Circuit
Vcc    Voltage (Common Cathode?)
VCM    Voice Coil Motor
VCO    Voltage Controlled Oscillator
VCR    VideoCassette Recorder
VCU    Virginia Commonwealth University
VD    Venereal Disease (see also STD)
VDFM    Virtual Disk File Manager
VDI    Virtual Device Interface
VDM    Vienna Development Method
VDM    Virtual Device Metafile
VDT    Video Display Terminal
VEEGA    Venus-Earth-Earth Gravity Assist (Galileo flight path) [Space]
VF    Video Frequency
VF    Voice Frequency
VFO    Variable Frequency Oscillator
VFR    Visual Flight Rules [Aviation]
VFW    Veterans of Foreign Wars
VFW    Volunteer Fire Department
VG    Very Good
VG    Vicar-General
VGA    Video Graphics Array
Vgg    Voltage (Gate to Ground?)
V&H    Vertical and Horizontal (CO coordinate tape) [Telephony]
VHDL    Vhsic Hardware Description Language
VHF    Very High Frequency (30-300MHz)
VHS    Video Home System (VCR)
VHSIC    Very High Speed Integrated Circuit
VI    VIsual editor
VIABLE    Vertical Installation Automation BaseLinE
VILE    VI Like Emacs
VINE    Vine Is Not Emacs
VIP    Very Important Person
VISTA    Volunteers In Service To America
VITA    Vme International Trade Association
VJ    Video Jockey
VL    Vulgar Latin
VLA    Very Large Array [Space]
VLBA    Very Long Baseline Array [Space]
VLBI    Very Long Baseline Interferometry [Space]
VLF    Very Low Frequency (3-30KHz)
VLIW    Very Long Instruction Word
VLSI    Very Large Scale Integration
VLT    Very Large Telescope [Space]
VM    Virtual Memory
VM/CMS    Virtual Machine/Conversational Monitor System
VMM    Virtual Memory Manager
VMOS    Vertical Metal Oxide Semiconductor (V-MOS) (see MOS)
VMR    Vertical Market Reseller
VMS    Vertical Motion Simulator [Space]
VMS    Virtual Memory System [DEC]
VOA    Voice Of America
VOIR    Venus Orbiting Imaging Radar (superseded by VRM) [Space]
VOIS    Voice-Operated Information System
VOQ    Visiting Officer's Quarters
VPI&SU    Virginia Polytechnic Institute and State University
VRC    Vertical Redundancy Character
VRM    Venus Radar Mapper (now called Magellan) [Space]
VRM    Virtual Resource Manager
VSAT    Very Small Aperture Terminal (satellite dish)
VSX    X/open Verification Suite
VTAM    Virtual Telecommunications Access Method [IBM]
VTOC    Volume Table Of Contents
VTOL    Vertical TakeOff and Landing
VTR    VideoTape Recorder
VUP    Vax Unit of Performance
V&V    Villains & Vigilantes
VVSS    Vertical Volute Spring Suspension
W    West
W    Width
WA    Washington
WA    Western Australia
WAC    Womens Air Corps
WAIS    Wide Area Information Server
WARC    World Administrative Conference
WATS    Wide Area Telephone Service
WB    Water Ballast
WB    WayBill
WBC    White Blood Cells
WC    Water Closet
WC    Without Charge
WCTU    Women's Christian Temperance Union
WD    White Dwarf [Space]
WECo    Western Electric Company [AT&T] (manufacturing arm of AT&T)
WFPC    Wide Field / Planetary Camera (on HST) [Space]
WFPCII    Replacement for WFPC [Space]
WG    Working Group
WH    WarHammer
WHBL    World Home Bible League
WHCA    White House Communications Agency [US Government]
WHO    World Health Organization
WI    Wisconsin
WIMP    Windows/Icons/Mouse Programming(?)
WIPP    (nuclear) Waste Isolation Pilot Plant [DOE]
WIS    WWMCCS Information System
WITS    Washington Interagency Telecommunications System
WIYN    Wisconsin / Indiana / Yale / NOAO telescope [Space]
WMSCR    Weather Message Switching Center Replacement
WOM    Write Only Memory
WOP    WithOut Papers [Immigration]
WOPR    War Operations Planned Response (from "Wargames" movie)
WORM    Write Once, Read Many times
WOW    Worlds of Wonder
WP    Word Processing
WP    Working Paper
WPI    Worcester Polytechnic Institute
WSI    Wafer Scale Integration
WSMR    White Sands Missile Range [Space]
WSW    West-SouthWest
WTR    Western Test Range [Space]
WU    Washington University
WU    Western Union
WUPPE    Wisconsin Ultraviolet PhotoPolarimter Experiment (Astro package) [Space]
WV    West Virginia
WW    World War
WWI    World War I
WWII    World War II
WWMCCS    World-Wide Military Command and Control System
WY    Wyoming
WYSIWIS What You See Is What I See
WYSIWYG What You See Is What You Get
XCF    eXperimental Computing Facility
XD    without Dividend
XDR    eXternal Data Representation
XFER    Transfer
XINU    XINU Is Not UNIX
XL    eXtra Large
XMM    X-ray Multi Mirror [Space]
XMTR    transMiTteR (the X is for trans)
XNS    Xerox Network Services
XO    eXecutive Officer
XOR    eXclusive OR (logical function)
XPORT    Transport
XSECT    cross SECTion
XTAL    crysTAL (another version of x for crys, see XMTR)
XUI    X-windows User Interface
XUV    eXtreme UltraViolet [Space]
YA    Yet Another
YACC    Yet Another Compiler Compiler
YB    YearBook
YMCA    Young Mens Christian Association
YMHA    Young Mens Hebrew Association
YOB    Year Of Birth
YP    Yellow Pages
YRS    Ysgarth Rules System
YSO    Young Stellar Object [Space]
YST    Yukon Standard Time
YT    Yukon Territory
YT    Yukon Time
YTD    Year To Date
YWCA    Young Womens Christian Association
YWHA    Young Womens Hebrew Association
Z    Zenith
Z    Zero
Z    Zulu (time)
ZB    Zero Beat
ZETA    Zero Energy Thermonuclear Assembly
ZGS    Zero Gradient Synchrotron
ZI    Zonal Index
ZIF    Zero Insertion Force (connector/socket)
ZIP    Zone Improvement Plan (US post office code)
ZK    barrage balloon (navy symbol)
ZMRI    Zinc Metals Research Institute
ZPG    Zero Population Growth
ZPRSN    Zurich Provisional Relative Sunspot Number
ZST    Zone Standard Time
ZT    Zone Time
ZWEI    Zwei Was Eine Initially

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