This should do it. Do it without the spaces between the characters. I add the space here because this website will show the symbol instead of the codes.
& # 1 8 5 ;
¹
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The square root symbol is Unicode 0x221A. To show it, you either need to draw it graphically, or you need to have a Unicode representation library.
√16=4
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.
This