Call Sign Definition

noun
The letters or, often, numbers and letters assigned to a licensed broadcasting station, amateur radio operator, etc. as identification, as for sending messages.
Webster's New World

(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.)

Wiktionary
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Other Word Forms of Call Sign

Noun

Singular:
call sign
Plural:
call-signs
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