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  2. Amateur radio call signs - Wikipedia

    en.wikipedia.org/wiki/Amateur_radio_call_signs

    (See discussion on the D9K call sign issued by Korea above – 'when 2 characters are needed'.) PPNS, 2×1 call sign prefix can be letter-letter, letter-digit, or digit-letter. A call sign composed of a letter, two digits, and one-letter is always a 2×1 call sign, meaning it has a letter-digit prefix and a single-letter suffix.

  3. Call sign - Wikipedia

    en.wikipedia.org/wiki/Call_sign

    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 identifier for a transmitter station. A call sign can be formally assigned by a government agency, informally adopted by individuals or organizations, or even ...

  4. Military call sign - Wikipedia

    en.wikipedia.org/wiki/Military_call_sign

    Military call sign. Military call signs are call signs (or callsigns) or specialized form of nickname assigned as unique identifiers to military communications. In wartime, monitoring an adversary's communications can be a valuable form of intelligence. Consistent call signs can aid in this monitoring, so in wartime, military units often employ ...

  5. Call signs in North America - Wikipedia

    en.wikipedia.org/wiki/Call_signs_in_North_America

    The call sign format for radio and television call signs follows a number of conventions. All call signs begin with a prefix assigned by the International Telecommunication Union (ITU). For example, the United States has been assigned the following prefixes: AAA – ALZ, K, N, W. For a complete list, see international call sign allocations.

  6. Call signs in the United States - Wikipedia

    en.wikipedia.org/wiki/Call_signs_in_the_United...

    Call signs in the United States. Call signs in the United States are identifiers assigned to radio and television stations, which are issued by the Federal Communications Commission (FCC) and, in the case of most government stations, the National Telecommunications and Information Administration (NTIA). They consist of from 3 to 9 letters and ...

  7. Broadcast call signs - Wikipedia

    en.wikipedia.org/wiki/Broadcast_call_signs

    Broadcast call signs are call signs assigned as unique identifiers to radio stations and television stations. While broadcast radio stations will often brand themselves with plain-text names, identities such as " cool FM ", " rock 105" or "the ABC network" are not globally unique. Another station in another city or country may (and often will ...

  8. Signal operating instructions - Wikipedia

    en.wikipedia.org/wiki/Signal_operating_instructions

    Signal operating instructions (SOI) or Communications-Electronics Operation Instructions (CEOI) are U.S. military terms for a type of combat order issued for the technical control and coordination of communications within a command. [1] They include current and up-to-date information covering radio call signs and frequencies, a telephone ...

  9. List of airline codes (F) - Wikipedia

    en.wikipedia.org/wiki/List_of_airline_codes_(F)

    Call sign Country Comments FRX Fort Aero: FORT AERO Estonia PBR Fast Air: POLAR BEAR Canada SRE Fly Jetstream Aviation: STREAMJET South Africa FTZ Fastjet: GREY BIRD