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These appear in decimal representations AFTER the decimal point. The two dots indicate the start and end of a string of numbers that should be repeated infinitely to get an exact decimal equivalent. If there is only one digit to be repeated, the two dots are replace by one.

For example,

1/11 = 0.090909 and on and on forever. This can be written with a dot over a 0 and and 9. I can't do that here but will put a dot superscript just after the digit, thus:

1/11 = 0.09.0. or 0.0.9.

or, for a longer repeating string, 9/7 = 1.285714285714....

= 1.2.85714.

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Q: Why do some numbers have two dots above them?
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