Pi was first applied to the third month, 14th day of the year by a physicist at the San Francisco Exploratorium in 1988, according to NASA. U.S. Congress declared March 14 National Pi Day in 2009.

The day on Friday, March 14, serves as a food fundraiser for the Ronald McDonald House and 125 Live with the added draw of a $3.14 margherita pizza. Chris De La Cruz, left, and Angel Cruz, both ...

Blaze Fast Fire’d Pizza: Rewards members can get one 11-inch pizza for $3.14 at participating U.S. locations, according to the Pasadena-based chain’s Pi Day 2022 web page. They will receive ...

National Pi Day is celebrated to give the constant value some attention. Pi, represented by the Greek letter "π," symbolizes the ratio of a circumference of a circle to its diameter (3.14).