Pi as a mathematical symbol was introduced by William Jones in 1706
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Pi is equaled to approximately 3.14 and is the circumference to diameter of a circle. Pi was first used in 1706 by William Jones. This would make the mathematical constant approximately 308 years old. The number
William Jones in 1706
1706 + 185 = 1,891
William Jones first used the pi symbol (π) in 1706
1706, it is also that same year that the letter "pi" (from the Greek alphabet) was first used in publication.