It seems like every day is another National “Something” Day on social media.

Pi, the number used to find the area and circumference of a circle, actually goes on infinitely.

It put pi at 62,831,853,071,796 digits.

Pi symbol on top of pies, perfect for a Pi Day celebration

Pi has its uses outside of math class, though.

It’s also Albert Einstein’s birth date and in 2018 was the day Stephan Hawking died.

The symbol went mainstream once Leonhard Euler who worked for Catherine the Great started using it.

pi written out on a chalk board

WhenABC Newsasked his daughter Sara Shaw why he wanted to celebrate March 14, she explained.

Back in 1988, Shaw organized what USA Today called a “pie festival.”

From that first celebration, things only started expanding.

the symbol for pi on a pie

Which beyond the obvious association between pi and pie might be why so many turn tobaking pieon March 14.

It is truly a science.

If you’re celebrating bybaking pies, we recommend this30-minute Chicken Pot Pierecipe for something savory.

Pepperoni shaped like pi on top of a pizza

If you’re craving sweet, you might’t mess up thisEasy Apple Pie.

Or, if you’re not ordering pizza, trymaking homemade pizza.