(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.

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

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

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

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

(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

(computing) The output of a compiler or assembler; it is not necessarily executable directly without linking to other modules

A substitution cipher