Radical Symbol
The radical symbol is used to represent taking the nthroot of a number
Format  Display  Data 

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TeX 
 
Unicode  √ 

Usage
Square Root
The radical symbol by itself is used to denote taking the square root of a number.
Radical
A radical is used to represent fractional exponents. By itself it is used to represent the square root of an expression, but it also is used to represent higher roots as well.