The radical symbol by itself is used in math to represent taking the square root of an expression. It is also used to represent taking the throot of a number when a number is place above the start of the symbol. Typically the radical symbol is used in an expression like this:
In plain language, this means take the square root of the number four. Shown below are various computer formats for the radical symbol.
Symbol  Format  Data 

√  Unicode 

TeX 


SVG 
The radical symbol by itself is used to denote taking the square root of a number.
The radical operator returns the nth root of the provided expression. The radical operator is an alternative way of writing a fractional exponent.