not on your keyboard. But there will in most word processing programmes a character map, and in this you'll find a sq root symbol, at least in the math character sets.
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The symbol for a a square root sign is: √
The only thing that a square root symbol does is that it symbolises an operation (taking the square root) of whatever is under the sign.
A radical.
This
I cant use the square root symbol so lets use the word "root" to represent square root. The answer would be 4root2