Whistling
Whistling is the production of sound by means of a constant breath of air through pursed lips and/or a whistle.
Many people are able to whistle, that is, to produce sound by forcing air through their lips which are shaped to create the required turbulence and a resonant chamber (the mouth). A more intense whistle may be created using the fingers to shape the opening - this allows the mouth to relax permitting a much more forceful stream to be blown through. This type of whistle is usually called a wolf-whistle.
Whistling can be varied in pitch to produce music; many performers on the Music Hall and Vaudeville were professional whistlers. Due to the audibility of whistling, it is used by referees at a sporting event to signal an infraction or the end of a time period. It is also used by police officers as a signalling device, and was employed for the same purpose by US Army officers during World War I.
There are also whistled languages.
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