Call-sign meaning

The letters or, often, numbers and letters assigned to a licensed broadcasting station, amateur radio operator, etc. as identification, as for sending messages.
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(broadcasting) A combination of letters and numbers used to identify a radio or television station.
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(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.)
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