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William first used the symbol for parallel.
William Jones first used the pi symbol (π) in 1706
The meaning of the infinity symbol is forever. The symbol it has no beginning and no end and is often used as a symbol of love and marriage.
The German mathematician Gottfried Wilhelm Leibniz used the symbol ~ for similarity, as used in geometry.
It is the RADICAL SIGN , its definition is - the symbol used to indicate a nonnegitive square root.