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Pedal

A pedal is a lever activated by one's foot. Examples include:

gas pedal: a lever in an automobile that, when depressed, gives more fuel to the automobile's engine.
bicycle pedal: a lever on a bicycle that, in combination with the crank arms, turns the gears.
organ pedal: a pedal on an organ that acts like a key on the organ keyboard; when depressed, it causes a note (or group of notes) to sound.

Geometry: see also pedal triangle, pedal curve[?].

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