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If it is a dot like a full stop used in literature then it is a decimal place. If it is a dot above a number after a decimal place it is a sign that shows recurring numbers for example 10/3=3.33333333333333333333333333 etc or just 3.3 reoccurring.

If it is a normal dot (.) then it is used as a decimal point, example 4.9. If it is a dot above a number after the decimal point, it is to show that the number is occurring again and again, which is also known as reoccurring.

There is also the dot product (or scalar product) of two vectors (a and b) which is represented by a dot:

a . b

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12y ago

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