Its On A Keyboard: N. Small Bumps On Certain Keycaps To Keep Touch-typists Registered (usually On The `5' Of A Numeric Keypad, And On The `F' And `J' Of A {QWERTY} Keyboard

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:tits on a keyboard: n. Small bumps on certain keycaps to keep
touch-typists registered (usually on the `5' of a numeric
keypad, and on the `F' and `J' of a {QWERTY} keyboard;
but the Mac, perverse as usual, has them on the `D' and
`K' keys).
-- The AI Hackers Dictionary

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