Euler
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The mathematician William Jones first used the Greek letter pi in 1706. In 1707, the great mathematician Euler popularized it.
The first known use of the symbol π to represent the mathematical constant approximately equal to 3.14159... was by Welsh mathematician William Jones in 1706. However, it was the Swiss mathematician Leonhard Euler who popularized the use of π in his mathematical works and made it widely recognized.
pi is a universal constant and was not invented by anybody. It was known to the ancient Babylonians long before the Swiss were literate.
what Englishman introduced the pi symbol, and in what year
No. the symbol for pi stems off of the Greek letter pi, probably due to the fact that the discoverer of pi was Greek.