In broadcasting and radio communications, a call sign (also known as a call name or call letters—and historically as a call signal—or abbreviated as a call) is a unique designation for a transmitting station. In North America they are used as names for broadcasting stations. A call sign can be formally assigned by a government agency, informal...
Found on
http://en.wikipedia.org/wiki/Call_sign
The conventional identifying code letters and/or numbers used to identify the sender of a wireless message or a radio transmitting station. Usually assigned by a national or international regulatory body.
Found on
https://www.encyclo.co.uk/local/20820
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