Most can remember when being in grade school the one thing in math class that was always drilled was.... Pi. yes 3.14159 or most commonly known as 3.14. So what is exactly is Pi day? Welp - the "symbol used in mathematics to represent a constant — the ratio of the circumference of a circle to its diameter — which is approximately 3.14159. Pi Day is an annual opportunity for math enthusiasts to recite the infinite digits of Pi, talk to their friends about math." However the most important part of Pi day is of course eating a good Pie- better known as pizza. Check out a few places where you can get a pie for low price.