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(1) In musical instruments, the levers and keys arranged in a specific order; one of the main parts of a keyboard mechanism. It normally consists of keys, a frame, and middle (axial) and forward (guide) pins. It was first used in the 12th century in organs, which usually had a foot keyboard (pedals) in addition to the manuals. In reed keyboard instruments, such as the accordion, the keyboard consists of a row of buttons on fingerboards and on the body itself. In wind instruments the term is sometimes used to designate the valve mechanism.
(2) The keys on any mechanism (a typewriter, calculator, and so on).