From airports to retail stores to hospitals, code words are used in almost every industry. Codes can simplify communication, disguise secret information, or pass messages to employees without alarming the general public.

While codes are meant to be covert, we've taken the time to reveal the hidden meanings behind some ubiquitous secret terms.

Maybe you're already familiar with a few of these clandestine phrases, but in case you're not, here's a quiz to test your Code Word knowledge.