A number, code, word, phrase, logo, device, etc., that is associated with an entity, and serves to differentiate that entity from other entities within the domain in which the identifier is assigned. An identifier can consist of an identifier string (i.e., a sequence of numeric and/or alphabetic characters assigned to an entity to serve as a unique identifier within the domain to which the identifier is assigned) and a prefix and/or suffix (a character or set of characters (numeric and/or alphabetic) appearing before or after an identifier string).
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