Whistles

thumb|A metal pea whistle thumb|A 3D-printable whistle

whistle that emits sound in the ultrasonic range

pipe or a non-diaphragm type whistle used on naval ships by a boatswain

device used to produce sound with the aid of live steam, which acts as a vibrating system

ancient whistle

Apito, which is the Portuguese word for "whistle", refers to any of a variety of whistles.

noise-making device attached to pigeons