It was a cool looking greek letter.
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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.
Pythagoras was the 1st person who used the pi symbol first
pi is greek for the number 3.14292 ect. It came from greek mathematicians thousands of years ago and is still used today
It was first introduced by the Welsh mathematician William Jones in 1706 and pi is the 16th letter of the Greek alphabet also it is the 1st letter of the Greek word for perimeter.