"Pi Day is an annual opportunity for math enthusiasts to recite the infinite digits of pi, talk to their friends about math, and eat pie," according to Piday.org.

Pi Day brings math lovers and fans of pie together to celebrate 3.14, one the best-known numbers in the world. It's a day for pizza and pie deals.

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What is Pi Day, and when was it first celebrated? Pi Day was first celebrated in 1988 at San Francisco's Exploratorium, a museum of science and technology that encourages visitors to be hands-on.

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National Pie Day, which is celebrated on Jan. 23, is separate from Pi Day, according to National Day Calendar. Pi Day, recognizing the mathematical constant, is celebrated on March 14.

Pi Day itself dates to 1988, when physicist Larry Shaw began celebrations at the Exploratorium science museum in San Francisco. The holiday didn’t really gain national recognition though until ...

Pi Approximation Day occurs every July 22nd. It celebrates pi, a key mathematical constant. Pi relates a circle's circumference to its diameter. William Jones introduced the π symbol in 1706.

Visit Casey's on Pi Day and take $3.14 off any large pizza. Casey’s customers can also play Rewards Match-up on its app for a chance to score freebies through April 7.

The day that celebrates the mathematical constant pi is Saturday. And because it's 2015, this particular sequence of numbers in the calendar that matches pi -- 3/14/15 -- won't come around for ...

The holiday has gotten such recognition that in March 2009, the U.S. House of Representatives designated March 14 as Pi Day. MORE: Indiana once tried to define Pi as 3.2. The bill almost passed.