Radical-sign meaning

The sign √ placed before a quantity, indicating extraction of the root designated by a raised integer. When extracting a square root, the raised integer is customarily omitted.
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The radical sign together with a horizontal bar extending from its top to the end of the expression from which a root is to be extracted.
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The sign (√ or ) used before a quantity to indicate that the square root (or a specified root indicated by an imposed index number) is to be extracted.
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