Pi was first used by the Babylonians and Egyptians.
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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.
The mathematician William Jones first used the Greek letter pi in 1706. In 1707, the great mathematician Euler popularized it.
The first digit of pi is 3, the first decimal is 1. Pi ≈ 3.14 The first fifty digits are 3.1415926535897932384626433832795028841971693993751
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.