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Archimedes first used the symbol PI because he was the first one to discover it so he wanted to investigate about it.
Any mathematician will use the number pi (and its symbol) sooner or later - it is a number used extensively in many different areas of mathematics.
The first known use of the symbol π to represent the mathematical constant approximately equal to 3.14159... was by Welsh mathematician William Jones in 1706. However, it was the Swiss mathematician Leonhard Euler who popularized the use of π in his mathematical works and made it widely recognized.
Mathematician Rudolph Swetchefriz{Added} The symbol is not "for" pi but is pi - one of the letters of the Greek alphabet.
i think Archimedes was the first to discover pi (3.14) or leonhard euler by brichelle xD