Homonym: Whistle (Signal)
A whistle is a small device that produces a loud sound when air is forced through it. It is often made of metal or plastic and has a narrow opening that creates a high-pitched tone. Whistles are commonly used in sports, signaling, and safety applications, allowing individuals to communicate over long distances without shouting.
Whistles can also be used in various contexts, such as by referees in sports to indicate fouls or by lifeguards to alert swimmers of danger. Additionally, some people use whistles for training dogs or as a tool in musical performances.