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call-sign ['kɔ:l,saɪn]
telecom.	呼叫标记; 应答码; 无线电台呼号
call sign
adv.	美国电台、电视台的字母代码密西西比河以东首字母为W, 以西为K
commun.	呼叫〔识别〕信号; 电台呼号
mil., air.def.	标志信号
radio.amat.	呼号
subm.	呼号
tech.	船名呼号; 通信呼号
telecom.	呼叫信号
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: 32 phrases in 7 subjects

Aviation	2
Electronics	3
Fishery fishing industry	1
General	2
Information technology	2
Technology	13
Telecommunications	9