Today is March 14th, also known as Pi Day. The reason why today is celebrated as Pi Day is due to the first three digits of the mathematical constant Pi are 3.14.
If you want to get really specific you can celebrate Pi in the 3 PM hour (think military time) as the next two digits of the number is 3.1415.
Pi is an irrational number is a real number that cannot be written as a fraction. Since it is an irrational number, it only can be written as an infinitely long, non-repeating number.
The mathematical constant Pi is the circle’s circumference to its diameter. That is the reason why we’re celebrating with pies that are circular; whether you like apple pie, pumpkin pie, or pizza pie – make sure to celebrate in style!