Happy PI Day

March 14 (written as 3-14 in the USA date format) is celebrated unofficially as Pi Day Pi Day is an annual celebration of the mathematical constant π (pi) with events mostly in the United States. Pi Day is observed on March 14 (the 3rd month) since 3, 1, and 4 are the first three significant figures of π and was founded in 1988 by Larry Shaw, an employee of a science museum in San Francisco, the Exploratorium. .