The word muffler can mean a scarf.

A muffler (North America) or silencer (outside North America) is a device for reducing the amount of noise emitted by a machine such as an internal combustion engine or a gun. The first was invented by Hiram Percy Maxim to silence firearms. When used on internal combustion engines, the engine exhaust blows out through the muffler.

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Mufflers are typically installed along the exhaust pipe of the engine. They usually contain a series of baffles to absorb sound, although the majority of the noise reduction is not through absorption but through destructive interference in the muffler itself. The muffler accomplishes this with a resonating chamber, which is specifically designed such that opposite sound waves are likely to colide, canceling each other out. They are a common piece of equipment on automobiles, usually slung under the rear of a car, but many diesel-powered semi trucks have large mufflers mounted vertically behind the cab.

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