English mathematician William Jones developed the symbol for Pi in 1706.
William Jones
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Pi was invented by William Jones in 1706 who was a Welsh mathematician.
archimedes a famous greek inventor invented pi
Mathematician Rudolph Swetchefriz{Added} The symbol is not "for" pi but is pi - one of the letters of the Greek alphabet.
The mathematician William Jones first used the Greek letter pi in 1706. In 1707, the great mathematician Euler popularized it.
Pi was first assigned as a symbol by mathematician William Jones in 1706.