You may have only used it during school, but for all the math enthusiasts out there, March 14th is a special day, that's because it's Pi Day.
While 3.14 has been used for many years to figure out the circumference of a circle, where did it really come from?
It's been represented by the Greek letter Pi since the 18th Century, but some historians think the ancient Egyptians had knowledge of pi, because the Great Pyramid of Giza actually equals out to 2 pi.
Since pi is considered by mathematicians as irrational number, that means it goes on forever. To celebrate the big day, 5 News hit the streets to see how many digits you could memorize.
While everyone here at home couldn't memorize it that well, one man actually recited nearly 25,000 digits of pi.