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.
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Pi as a mathematical symbol was introduced by William Jones in 1706
I think its this symbol
The square root symbol (√) was first used in 1525, by Christoph Rudolff, and is called a radical.
maximum
The mathematical symbol for "undefined" is the infinity symbol.