Math enthusiasts around the world, from college students to rocket scientists, celebrate Pi Day, which is March 14 or 3/14 — the first three digits of an infinite number with many practical uses. Many people will mark the day with a slice of pie — sweet,

Pi Day isn't just about showing off how many numbers you have memorized; restaurants offer deals and discounts on pizza on. Pi Day occurs on March 14, because the date is written as 3.14 in the United States.

Years ago, the infinite decimal 3.14 or its Greek symbol pi was mostly known to math and science geeks, but now March 14 is also a day for tasty deals. Here’s a little history to whet the appetite. The first “Pi Day” celebration was held in San Francisco in 1988 when a physicist at the Exploratorium,

Pi (π) is a mathematical constant that represents the ratio of a circle's circumference to its diameter. It's an irrational number, meaning its decimal representation goes on infinitely without repeating.

Here are all the best food deals on Pi Day, March 14, on pie, pizza and beyond from Taco Bell, Burger King, DoorDash, Pizza Hut and more chains.