code

(noun) a set of rules or principles or laws (especially written ones). Synonyms: codification.

(noun) a coding system used for transmitting messages requiring brevity or secrecy.

(noun) (computer science) the symbolic arrangement of data or instructions in a computer program or the set of such instructions. Synonyms: computer code.

(verb) attach a code to. Examples: "Code the pieces with numbers so that you can identify them later."

(verb) convert ordinary language into code. Synonyms: encipher, cipher, cypher, encrypt, inscribe, write in code. Examples: "We should encode the message for security reasons."