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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.
Usually, in code, the square root symbol is denoted as: sqrt() where the number inside the square root is written inside the brackets. For example, if you wanted the square root of 64, write: sqrt(64)
It is 221A + Alt X
The symbol for a a square root sign is: √
press alt and then v (at least it worked on mine)