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A dot above a letter is known as a 'diacritic dot'. The common name for the diacritic dot above an i or a j is a 'tittle'.
that dot means reccurent, its usually above a decimal number, & means that digit continues on forever. E.g. put 1/3 as a decimal. this wouldn't be 0.3 it would be 0.3 (with the dot above the 3) so for the example above the answer is 0.333333333333333333333333333(continues on forever) By the way, the number can have a dot on more than one of its digits
put a dot above the repeated number which is after the decimal
The dot between the ones and the tenths is called the decimal point.
It can refer to degrees if it is above and slightly to the right. A dot, (not a circle) directly above a number would represent a repeating digit in the decimal representation of a number.