Happy Pi Day!
It's a Greek letter. We spell it "pi". It sounds like "pie". We write it like "π". It is the symbol for the mathematical constant representing the ratio of a circle's circumference to its diameter. It might seem like a boring math concept we hoped we had left behind in school, but it's way more than that. It permeates and underpins various aspects of modern civilization. From the buildings we live in to the technologies we rely on, pi plays an often invisible but crucial role in our everyday lives.