What mathematician developed the symbol for Pi?

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pythagoras. he had lots of different theorums, one named after him in fact(pythagorases theorum) he came up wth the symbol from ancient greek drawings.
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Who developed the symbol pi?

The symbol for pi was used by the early English mathematicians William Oughtred (1574 -1660), Isaac Barrow (1630-1677), and David Gregory (1661-1701) to designate the circumfe