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Pi as a mathematical symbol was introduced by William Jones in 1706
William Jones first used the pi symbol (π) in 1706
William Jones, a Welsh mathematician, first used the pi symbol in 1706.
The symbol comes from the Greek alphabet.
Pi Day can be celebrated by eating a pie, discussing topics related to pi, dressing in pi-ralated apparel, such as a shirt with the pi symbol on it, or doing anything else related to pi.