A whistle is a small, handheld device that produces sound by blowing air through a hole in a chamber. A siren is a larger, stationary device that produces sound by rotating a perforated disk in front of a jet of air. Whistles are typically used for signaling or communication, while sirens are used for warning or alerting.

There are many different types of whistles, each with its own unique sound and purpose. Some of the most common types of whistles include: pea whistles, police whistles, train whistles, and bird whistles.

When choosing a whistle, it is important to consider the following factors: the sound you want to produce, the volume you need, and the durability you require. If you are not sure which whistle is right for you, you can consult with a safety expert.

To use a whistle, simply blow air through the hole in the chamber. The shape of the chamber and the hole will determine the pitch and volume of the sound. You can experiment with different blowing techniques to create different sounds.