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Reference.org
PLUM keyboard
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<p>The PLUM keyboard is a keyboard layout which differs from the traditional <a href="/facts/QWERTY_keyboard/0DCjXEa9">QWERTY keyboard</a> in both physical key layout and letter arrangement. Unlike most keyboards, the PLUM keyboard organizes keys in a square grid, as opposed to the staggered rows of a typewriter. Though the Plum Keyboard is currently off-line, it is still being promoted. </p><p>As of 2012<a href="https://en.wikipedia.org/w/index.php?title=PLUM_keyboard&action=edit">[update]</a>, PLUM keyboards are no longer being manufactured. </p>