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Pythagoras was the 1st person who used the pi symbol first
Archimedes first used the symbol PI because he was the first one to discover it so he wanted to investigate about it.
Mathematician Rudolph Swetchefriz{Added} The symbol is not "for" pi but is pi - one of the letters of the Greek alphabet.
It was a cool looking greek letter.
The ancient Greeks did the original work of inventing geometry as we know it, and pi is a letter in the Greek alphabet, so it was a convenient symbol for them to use.