(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.

(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

(computing, derogatory) Software code that has had many editors with conflicting styles, making it nearly impossible to maintain.

(video games) A line of text or series of commands which can be used to change a game's behavior, alter a character's looks and abilities, skip levels, or access other hidden features.

A code chosen for use within a communications system for transmission purposes.