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.
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It was a cool looking greek letter.
Pi.
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.
It's basically 22/7 as a fraction
mathalets from the 3rd century in 130 ad from babylonian discovered that pi equals 3.14567789870989977890.....