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Pythagoras was the 1st person who used the pi symbol first
Pi as a symbol was first used by the English mathematician William Jones. In 1706 he wrote that 3.14159=Euler, in 1737, used this symbol and it became the worlds standard symbol for pi after that.
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.
Archimedes first used the symbol PI because he was the first one to discover it so he wanted to investigate about it.
Actually, the number was discovered and then a symbol had to be assigned to it. Letters of the Greek alphabet are traditionally used for mathematical things, to the symbol for pi was naturally chosen from the Greek alphabet.