2½ ie 2 to the power of one-half.
The power "one-half" applied to any value signifies that value's square root.
Do not confuse with the power "-1" which indicates the reciprocal of the given value.
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2 square root 17
5 (square root) 2
5 radical 2
20 times the square root of 2
Square root of 324 is 18 or 3 times the square root of 2