Jisho

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Noun
1. identifying signal; recognition signal; (radio) call sign
Wikipedia definition
2. Call signIn 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, informally adopted by individuals or organizations, or even cryptographically encoded to disguise a station's identity.
Read “Call sign” on English Wikipedia
Read “識別信号” on Japanese Wikipedia
Read “Call sign” on DBpedia

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