Call sign

A 1940 QSL card for WWV, indicating its early location in the U.S. state of Maryland.

Some U.S. states issue call sign license plates for motor vehicles owned by amateur radio operators.

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 transmitter 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.

单词	Callsigns
释义	Callsigns 英语百科 Call sign 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 transmitter 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.
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Callsigns

Call sign