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call-sign ['kɔ:l,saɪn]
telegr.	sygnał identyfikacyjny; znamię n
call sign
commun.	znak wywoławczy; sygnał wywoławczy
English thesaurus
call sign
mil., logist.	Any combination of characters or pronounceable words, which identifies one or more communication facility, a command, an authority, an organization, or a unit; used primarily for establishing and maintaining communications. (FRA)
USA	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 (JP 3-50)

call-sign : 3 phrases in 2 subjects

Communications	2
General	1