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Pythagoras was the 1st person who used the pi symbol first
It was introduced by the Welsh mathematician William Jones in 1706
It has been represented by the Greek letter "π" since the mid-18th century.
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.