It is 221A + Alt X
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press alt and then v (at least it worked on mine)
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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.
It is a keyboard, not a keybored ! There is no square root button on a standard keyboard, but if you are bored, you can find out how to program a key and get one of the keys to be your square root key.
The symbol for a a square root sign is: √