plural of code black

A flight number.

A biochemical signal or marker, especially one used for security purposes. / A signal consisting of a biological action.

To mark using a bio-code.

Alternative form of zip code

plural of code cave

(programming) A sequence of null bytes in a process's memory, offering the capacity for the injection of custom instructions by a hacker.

(UK, law enforcement) A code used by British police to identify the apparent ethnicity of a person

A code consisting of various coloured handkerchiefs placed in the back pocket used to indicate sexual preferences of the wearer.

simple past tense and past participle of bio-code