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6' = 6 feet
I will assume that you mean " to the power of two ". A symbol for any n-power is to put the number (n) on the side, above the number. Like this: nn.
It's the number of notifications you have. Check that it matches.
its like a number on top of a number. sort of like a fraction... the dots are numbers and the line is like the fraction bar.
there is no symbol for it.