Add Yahoo as a preferred source to see more of our stories on Google. Math students everywhere will be eating pies in class this week in celebration of what is known as Pi Day, the 14th day of the 3rd ...

JACKSONVILLE, Fla. – Tuesday is March 14, also known as National Pi Day. The celebration is based on the first three digits of pi, 3.14. So what exactly is pi, often symbolized as the Greek letter π?

Whether using 3.141 or the record-holding 314 trillion–digit calculation announced in December 2025 by Storage Review Lab director Kevin O'Brien, every representation of π is still an approximation.

Add Yahoo as a preferred source to see more of our stories on Google. This number-themed day dates back to 1988, when physicist Larry Shaw decided to host a circle walk to honor the mathematical π ...