It's basically 22/7 as a fraction
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Pi.
It was a cool looking greek letter.
Pi can be used to calculate the area of a circle Pi can be used to calculate the circumference of a circle
mathalets from the 3rd century in 130 ad from babylonian discovered that pi equals 3.14567789870989977890.....
Study of circles. It was derived by mathematicians(Greek?) who developed an infinite series to describe it.