The code 7700 is a general emergency signal for aircraft. Code Adam This is an alert for a missing child that’s used in many public locations like malls, hospitals, supermarkets, and museums.

RELATED: What we know about the Rice University student killed in an apparent murder-suicide on campus Here are five emergency code words you can use to signal danger to your friends: 1 ...

Some words, when used in specific situations, have deeper meanings than you realize: They’re codes to alert those in the know while keeping others in the dark.

Code words like "oscar" are used to alert crew members of emergencies without causing mass panic. Other terms, like "babaloo" and "mamagayo," are used to describe annoying guests or employees.

Flight attendants use specific words and phrases to indicate emergencies -- ranging from hijackings to missing children -- sans frightening passengers.

ARLINGTON COUNTY, Va. (7News) — The Federal Communications Commission (FCC) established a new alert code Wednesday for missing or endangered people in Tribal communities. Officials said the new ...