An aerodynamic whistle (or call) is a simple aerophone, ... - dofaq.co
whistle

An aerodynamic whistle (or call) is a simple aerophone, ...

wikipedia - 10 Jul 2015
An aerodynamic whistle (or call) is a simple aerophone, an instrument which produces sound from a stream of gas, most commonly air. It may be mouth-operated, or powered by air pressure, steam, or other means. Whistles vary in size from a small slide whistle or nose flute type to a large multi-piped church organ.

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