Pea whistle

A whistle is a musical instrument which produces sound from a stream of gas, most commonly air. The whistle makes a high-pitched, piercing, and shrill sound. It is a type of fipple flute, and 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.

Whistles have been around since early humans first carved out a gourd or branch and found they could make sound with it. In prehistoric Egypt, small shells were used as whistles. Many present day wind instruments are inheritors of these early whistles. With the rise of more mechanical power, other forms of whistles have been developed.