The Greek letter π was adopted for the number from the Greek word for perimeter "περίμετρος", first by William Jones in 1707, and popularized by Leonhard Euler in 1737.
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William Jones first used the pi symbol (π) in 1706
William Jones, a Welsh mathematician, first used the pi symbol in 1706.
Archimedes
William Jones in 1706
Pi as a mathematical symbol was introduced by William Jones in 1706