"Pi" is the ratio between the circumference and the diameter of a circle. The Greek letter Ï€ (pi) was first adopted for the number as an abbreviation of the Greek word for perimeter (πεÏίμετÏος), or as an abbreviation for "periphery/diameter", by William Jones in 1706.
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Pi.
Pi as a mathematical symbol was introduced by William Jones in 1706
Maurits Escher was a remarkable Swiss mathematician and teacher that was responsible for instituting the use of the symbol pi in mathematical notation.
Euler
Lindemann