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The raised dot on the center (number five) is to orient the user who can't see the numbers to dial. When you recognize the number five in the center, you can correctly identify the other numbers by location in relation to the 'marked' button.

The F and J on a keyboard usually have a raised dot on them to orient the index finger on each hand to the correct position. Very helpful if you use your computer in a dark room.

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13y ago

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