Help need sign

The way my interpreters have always done it was to "draw out" the symbol.

If they wanted to say "square root of 4", they would sign "4" then draw out the square root around that 4 as it were written on paper.

The same goes for square (or any exponents). If they wanted to say "4 squared", they would sign "4" and then move their hand up to the corner space of the "4" they just signed and then twist their wrist once as they signed "2". If it was "4 cubed", it would be "3" instead of "2". :)
 
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