The line over a repeating decimal is called the vinculum.
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It is placed over one length of repeating decimal digits.
0.63636 as a repeating decimal is 0.63 with a line over the 6 and the 3 Hope this helps :))
The line over the digits that repeat in a repeating decimal.
For a single repeating digit, it is a dot over the digit.For string of repeating digits, it can be a dot over the first and last repeating digits, or a bar over the repeating string.
A Vinclulum