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periodic line
If there is a line over a decimal, it means the decimal is repetitive. If you are typing it would look like this... .7
Either, the decimal with a line over what's repeating (eg. 0.6 with a line over it), or decimal repeating (eg. "point six repeating").
If the threes go on indefinitely, then it is a repeating decimal, represented by a line over the repeated number, also .333...(going on forever) is equivalent to 1/3
If handwritten, draw a line over the repeated numbers.