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.
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0.7777 repeating is a decimal.
3.66 repeating is a decimal.
0.370 repeating is a decimal.
1.21 repeating ... is a decimal.
3.25 repeating ... is a decimal.