Whistle

A whistle is a one-note woodwind instrument which produces sound Sound

Sound is a disturbance of mechanical energy [i] that propagates through matter [i] as a wave [i]. ... 

 from a stream of forced air. Many types exist, from small police Police

Police forces are government organizations [i] charged with the responsibility of maintaining law [i] and ... 

 and sports whistles , to much larger train whistles, which are steam whistle Steam whistle

A steam whistle [i] is a device used to produce sound [i] with the aid of live steam [i]. ... 

s specifically designed for use on locomotive Locomotive

A locomotive is a railway [i] vehicle [i] that provides the motive power for a train [i] ... 

s and ship Ship

A ship is a large, sea-going watercraft [i]. ... 

s.

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A whistle is a one-note woodwind instrument which produces sound Sound

Sound is a disturbance of mechanical energy [i] that propagates through matter [i] as a wave [i]. ... 

 from a stream of forced air.
Many types exist, from small police Police

Police forces are government organizations [i] charged with the responsibility of maintaining law [i] and ... 

 and sports whistles , to much larger train whistles, which are steam whistle Steam whistle

A steam whistle [i] is a device used to produce sound [i] with the aid of live steam [i].
... 

s specifically designed for use on locomotive Locomotive

A locomotive is a railway [i] vehicle [i] that provides the motive power for a train [i]... 

s and ship Ship

A ship is a large, sea-going watercraft [i]. ... 

s.

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