(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.

plural of source code

(computing) Any character used to specify a function of a piece of software or hardware (such as carriage return of a printer)

plural of area code

A sequence of letters and/or numbers added to a postal address to aid the sorting and delivery of post/mail.

plural of ZIP Code

(computing) A numeric value or string of such values that triggers a specific command or action to occur, rather than displaying a text character.

(mathematics) The branch of mathematics dealing with the art of transmitting messages reliably over a noisy channel by adding redundancy to the message.

A numeric code generated at regular intervals by a timing system.