Happy National Pi Day.

It's March 14th or 3.14. The date represents the ratio of a circle's circumference of 3.14159265359.

Just about anything shaped like a circle should probably on sale today. Mostly, it's Pizza chains that take advantage of the day. You'll find plenty of deals at the national chains today in the video above, and if you know of any local shops celebrating Pi Day feel free to add them in the comments section on social media.

More Pi Day deals can be found online with the video below.

Still want more Pi Day? Learn to sing the Pi Day song! Here's a purple monster to help ya learn the tune.