Horn loudspeakers are often used to broadcast sound in outdoor locations.

NATO reporting names are code names for military equipment from Russia, China, and historically, the Eastern Bloc (Soviet Union and other nations of the Warsaw Pact).

- NATO reporting name

Although this was started by the Air Standards Co-ordinating Committee (ASCC) formed by the United States, UK, Canada, Australia, and New Zealand, it was extended throughout NATO as the NATO reporting name for aircraft, rockets and missiles.

- Code name

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