π (/paɪ/)

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 The number π (/paɪ/) is a scientific consistent. It is characterized as the proportion of a hover's circuit to its distance across, and it likewise has different comparable definitions. It shows up in numerous equations in every aspect of science and material science. It is roughly equivalent to 3.14159.

Archimedes of Syracuse
The Egyptians calculated the area of a circle by a formula that gave the approximate value of 3.1605 for π. The first calculation of π was done by Archimedes of Syracuse (287–212 BC), one of the greatest mathematicians of the ancient world.
It was not until the eighteenth century — around two centuries after the centrality of the number 3.14 was first determined by Archimedes — that the name "pi" was first used to mean the number. ... "He utilized it in light of the fact that the Greek letter Pi relates with the letter 'P'… and pi is about the border of the circle."

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