(British spelling) Any system where colours are used to categorize elements of sets.

(British spelling) To mark items with a colour code as a means of sorting.

(computer science) A system of instructions and data directly understandable by a computer's central processing unit.

Any code whose elements may take one of three values

Non-redundant software code comprising of focussed task-specific modules and functions, written in a systematic manner so that another coder can easily interpret or modify it.

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

A set of rules dictating acceptable behaviour and decisions in a specified environment.

(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) Human-readable instructions in a programming language, to be transformed into machine instructions by a compiler, assembler or other translator, or to be carried out directly by an interpreter.