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

(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.

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

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

(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.

A code used on DVDs to identify which region's DVD player it will play in. / A code used in DVD players to allow only DVDs being sold in that region to be played.

A binary coding system in which successive values differ in just one digit position.