radical sign

radical sign

noun Mathematics.
the symbol √ or indicating extraction of a root of the quantity that follows it, as √25=5 or .

Origin:
1660–70

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
radical sign
 
n
the symbol √ 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 ³√

Collins English Dictionary - Complete & Unabridged 10th Edition
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Radical sign is always a great word to know.
So is quincunx. Does it mean:
a chattering or flighty, light-headed person.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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