For those of you that didn't know it, today is Pi Day. Not into mathematics? Use it as an excuse to have regular pie...or pizza pie. The Consumerist has rounded up a bunch of Pi Day deals for those of you interested.
Pi (Greek letter “π”) is 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 has been calculated to over one trillion digits beyond its decimal point. As an irrational and transcendental number, it will continue infinitely without repetition or pattern. While only a handful of digits are needed for typical calculations, Pi’s infinite nature makes it a fun challenge to memorize, and to computationally calculate more and more digits.