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Pi was first assigned as a symbol by mathematician William Jones in 1706.
Actually, the number was discovered and then a symbol had to be assigned to it. Letters of the Greek alphabet are traditionally used for mathematical things, to the symbol for pi was naturally chosen from the Greek alphabet.
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.