code

noun:a system of words, letters, figures, or symbols used to represent others, especially for secrecy
- The spies used a complex code to communicate securely.
noun:a set of instructions for a computer program
- She wrote the code for the new application in Python.
noun:a systematic collection of laws or regulations
- The building was constructed according to the city's safety code.
verb:to have a cardiac arrest
- The patient started to code, and the medical team rushed to the room.