Every year, Pi Day is celebrated in order to celebrate the mathematical constant π (pi). This day is observed on March 14 because it represents 3/14 in the month/day date format and 3, 1, and 4 are the first three digits of π. The United States House of Representatives supported the designation of Pi Day in the year 1999. <br/><br/>Pi Day is celebrated in a number of ways, such as throwing and eating pies, and discussing the significance of the number π, due to a pun based on the words "pi" and "pie" in English languages.<br/><meta content="cms.next" name="cmsei"/>