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Definition of Call sign
1. Noun. (broadcasting) A combination of letters and numbers used to identify a radio or television station. ¹
2. Noun. (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.) ¹
¹ Source: wiktionary.com