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William first used the symbol for parallel.
if used in a decimal it means that the number it is over is repeating ex) 27.33333333333333 instead you could write 27.3 with a line over the 3
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.