A squeak sound is a short, high-pitched, sharp noise that is often brief and somewhat shrill, similar to the sound made by a mouse, a rusty hinge, or a rubber shoe on a polished floor. Acoustically, a squeak is characterized by a high frequency, usually above 2000 hertz, with a rapid onset and quick decay. Squeaks are produced when two surfaces rub together with friction and stick-slip motion, causing vibrations, such as rubber against glass, or when small animals vocalize. Examples of squeak sounds include a mouse squeaking, a door hinge squeaking, sneakers squeaking on a basketball court, a balloon squeaking when air is released, or a toy squeaky toy making noise when squeezed. In onomatopoeia, squeak is written as eek or squeak. The sound is often considered annoying or attention-getting because human ears are sensitive to high frequencies. Squeak sounds can indicate need for lubrication in mechanical contexts, like brakes squeaking or belts squeaking in cars, or can be intentional in toys and shoes designed to make squeaking noises for fun or alerts.
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