stefan, Happy Pi Day!
"The Greek letter appears on p. 243 [of William Jones's 1706 work Synopsis Palmariorum Matheseo] in the phrase "½ Periphery (π)", calculated for a circle with radius one."
https://en.wikipedia.org/wiki/Pi
"Why that letter? It’s the first Greek letter in the words “periphery” and “perimeter,” and pi is the ratio of a circle’s periphery — or circumference — to its diameter."
https://apnews.com/article/pi-day-celebration-math-infinite-number-f426c8659529cb07655b5f07b99ce1dd
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