The Greek alphabet.
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It is 4/3*pi which does not have a specific name.
PI the 16th greek letter is the circumference divided by the diameter of a circle. For example 40.5/12.89 = PI.
3.14 is short for pi. Pi can go on forever and ever. It's just a rounded number of pi to make things easier to understand.
PI is the Latin name of the Greek letter(by Greek letter I mean the PI symbol.
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