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Those keys are embossed to assist both the touch-typist and the partially sighted. They help them to know where their fingers are on the keyboard. If you have a numeric keypad to the right of your keyboard you will also notice a similar embossing on the 5 key.

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15y ago
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13y ago

probably it is braille for blind people who are typing.

Back in the old days when people were actually taught to type without looking

at the keyboard, the F and the J are where the index finger of your left and right hand are to be placed on Home Row. Therefore, the little "bump" lets you know that your hands are placed correctly - on the F and the J (without having to look).

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14y ago

the letters j and f have lines on the keys for finger placement when typing properly. they indicate where your pointer finger should be placed.

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Q: Why does the letter f and j have a little bump in the key board and?
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