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the symbol ÝA placed before a number or quantity to indicate the extraction of a root, esp a square root. The value of a higher root is indicated by a raised digit in front of the symbol, as in 3ÝA
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
radical sign[′rad·ə·kəl ‚sīn]
The symbol √, indicating that a root of a quantity is to be taken.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.