(programming, rare) Computer program code characterized by several well-defined and separable layers forming a hierarchy of subsystems.

(computing) code that can never be reached during program execution because no part of the program calls it or branches to it.

(slang, sometimes derogatory) A computer programmer.

(radio) A code used to express the quality of a radio signal being received, standing for Readability, Strength and (for nonvoice communication) Tone.

(radio) code used as a shorthand for common messages, consisting of sequences all beginning with Q / (radio) specific code from the aforementioned set

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

(programming) Synonym of boilerplate

present participle of hard code