Radical Sign
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It is the RADICAL SIGN , its definition is - the symbol used to indicate a nonnegitive square root.
You can use the common X multiplication symbol, a dot, or use parenthesis with a coefficient next to them.
I think its this symbol
The radical symbol for square root, without the vinculum above the radicand, was introduced in 1525. The first author to use it was Christoff Rudolff.
it looks like a check mark. it is called the radical. it looks like this --> √