A set of guidelines and regulations to be followed by members of some profession, trade, occupation, organization etc.; does not normally have the force of law.

(Britain) a set of rules and regulations aimed at tourists visiting the countryside

(US) A postal code, especially for addresses served by the US Postal Service, consisting of a five- or nine-figure number. / (US, by extension) Any postal code.

(transitive) To provide with, or allocate to, a zip code.

A typically alphanumeric sequence that permits access to a secure service or network.

(programming) Overly structured program source code, with many small sections, functions etc that should be combined.

(programming, informal, derogatory) Unstructured or poorly structured program source code; especially code with many GOTO statements (or their equivalent).

(business) An account designator, especially one that is not purely numeric.

(genetics) The set of rules by which the sequence of bases in DNA are translated into the amino acid sequence of proteins.

(Internet) A set of codes used in sigblocks to broadcast the (typically computer-related) interests, skills, and aspirations of the poster.