What is a code name?

Answer 1

Code names are names given to people (usually on a secret mission or to disguise themselves) so a group of people can talk to each other using their code names without giving away their names. Since the first or last name alone is vital information that is usually kept a secret in missions, code names are given to people to protect their identity from the enemy or opponent. (Code names are also given to the mission and objects to disguise the overall objective and mission itself, as not to give away its overall goal if an opponent or civilian were to find out about its existence).

Answer 2

A code name or cryptonym is a word or name used clandestinely to refer to another name or word. They are often used by the military.