(1) A logical subset of volumes in a tape library. A category can be assigned by the library manager (for example, the insert category) or by the software (such as, the private or scratch categories).
(2) A word, phrase, or number used to group documents in a view.
(3) The recommended security specifications needed for both the CICS transaction definitions and the corresponding RACF profiles.
(4) An optional grouping of entities that are related in some way, such as messages or assets that relate to a particular application. See also message.
(5) A container used in a structure diagram to group elements based on a shared attribute or quality.