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Keyboard
A keyboard is a data entry or control device using a number of keys which are to be pressed by the fingers. There are two main types of keyboard:
- Alphanumeric keyboards (including the typewriter keyboard, the generic computer keyboard and its descendant the IBM PC keyboard)
- Musical keyboards
Other types of keyboards, known as "numeric keypads", are the
- Calculator keypad (with the 123 keys near the bottom)
- the CCITT telephone keypad[?] (with the 123 keys at the top), arguably the most common keyboard layout in the world, with roughly 700,000,000 telephones in the world (estimated, as of 1994).
See: Keyboard layout
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