- Pi Day is celebrated annually on 14 March, commemorating the mathematical constant pi, which is approximately 3.14.
- The holiday was established in 1988 by physicist Larry Shaw at the Exploratorium science museum in San Francisco, to honour mathematics.
- Many restaurants and food chains in the U.S. offer special promotions on circular food items, like pizzas and pies, to mark the occasion.
- Deals include 7-Eleven offering one-topping pizzas for $3.14 and Burger King giving a Hershey's Sundae Pie or Cinnamon Apple Pie away free with a minimum spend.
- Blaze Pizza is offering a buy-one-get-one deal on its 11-inch pizzas for $3.14, while those ordering Pizza Hut through DoorDash can receive a free pizza when ordering a medium or large 'Create Your Own'.
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