(*) A call sign assigned in accordance with the provisions of the International Telecommunications Union to identify a radio station. The nationality of the radio station is identified by the first or the first two characters. (When used in visual signaling, international call signs are referred to as signal letters.) See also call sign.
INTERNATIONAL CALL SIGN
Meaning of INTERNATIONAL CALL SIGN in English
DOD English dictionary of military terms. Английский словарь военных терминов DOD. 2012