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Same reason there are dots on the "f" adn "j" keys of a keyboard - so you can touch type. I think that it is for blind people, so that they can feel around the keyboard for the dot, and use all the numbers around it to phone or text someone. Also, computer keyboards often have a dot on the "j" and the "f" keys.

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Q: Why is there a dot on the number five on phones and calculators?
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