the letters or, often, numbers and letters assigned to a licensed broadcasting station, amateur radio operator, etc. as identification, as for sending messages
See call letters.
(plural call signs)
- (broadcasting) A combination of letters and numbers used to identify a radio or television station.
- (military) Any combination of characters or pronounceable words, which identifies a communication facility, a command, an authority, an activity, or a unit; used primarily for establishing and maintaining communications. Also called CS. (JP 1-02 Department of Defense Dictionary of Military and Associated Terms.)