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If you're not asking how companies that make keyboards produce raised letters on the keys, then please be more specific.

There are a couple of ways this could be done.

The letters could be molded in. I'm not aware that anyone actually does this, but it would work.

The ink used to paint the letters on has a certain thickness after it dries. By carefully choosing the ink used, this can produce noticeably raised letters.

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14y ago

What else can I help you with?