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1. A set of unambiguous rules specifying the manner in which data may be represented in a discrete form. Note 1: Codes may be used for brevity or security. Note 2: Use of a code provides a means of converting information into a form suitable for communications, processing, or encryption. (188) 2. [Any] system of communication in which arbitrary groups of letters, numbers, or symbols represent units of plain text of varying length. Note: Codes may or may not provide security. Common uses include: (a) converting information into a form suitable for communications or encryption, (b) reducing the length of time required to transmit information, (c) describing the instructions which control the operation of a computer, and (d) converting plain text to meaningless combinations of letters or numbers and vice versa. [NIS] 3. A cryptosystem in which the cryptographic equivalents, (usually called "code groups") typically consisting of letters or digits (or both) in otherwise meaningless combinations, are substituted for plain text elements which are primarily words, phrases, or sentences. 4. A set of rules that maps the elements of one set, the coded set, onto the elements of another set, the code element set. Synonym coding scheme. 5. A set of items, such as abbreviations, that represents corresponding members of another set. 6. To represent data or a computer program in a symbolic form that can be accepted by a processor. 7. To write a routine.