Limit fields, when combined with other search terms, are particularly useful for focusing or limiting a search. To search a limit field, use the ⌡in≡ or ⌡=≡ operators with the field abbreviation, e.g. 8806 in ud or ud=8806. Omitting the field label retrieves information from "free text" fields only. Numeric limit fields may also be used with other special operators: