Greek.
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The symbol of pi is 16th letter of the Greek alphabet and it was chosen because the first letter of the equivalent of the word perimeter begins with pi in the Greek language.
The 'symbol' is a letter in the Greek alphabet - which is pronounced 'pi'. The connection between the letter and the ratio of the diameter and the circumference fo a circle may come from the fact that the letter pi is the first letter of the Greek word for perimeter, and the word for periphery.
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.
Pythagoras was the 1st person who used the pi symbol first