For those of you who are math junkies, you might already know that today is Pi Day. Pi Day is a “holiday” celebrated every March 14th (3/14).
The Greek letter "pi" is the mathematical symbol for the relationship between the circumference of a circle and its diameter. Pi = 3.14. Because March 14 is 3/14 (and pi is 3.14 . . . ), this day is considered Pi Day.
For more information, you should check out the official Pi Day website.