Wednesday marks the 30th anniversary of Pi Day's creation and celebration as a holiday, and it's also coincidentally physicist Albert Einstein's birthday.
March 14 is celebrated as Pi Day when the date lines up in the numbers of the famous constant.
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Google asked Cronut inventor Dominique Ansell to create the doodle for Pi Day, which was first recognised by physicist Larry Shaw. Ansel, in his signature chef style, honoured the mathematical constant by demonstrating the pi formula using his personal Salted Caramel Apple Pie recipe.
Pi represents the ratio between a circle's circumference (perimeter) to its diameter (distance from side to side passing through the center), and is a fundamental element of many mathematical fields, most significantly Geometry.
According to piday.org, Pi has been calculated to over one trillion digits beyond its decimal point. It's an important part of the foundation of mathematics, most importantly geometry, where pi is key to equations calculating the area of a circle, A = π r, and the volume of a cylinder, V = π rh.
But many observe the day with a different sort of circle, in the form of pie, or pizza. Therefore, it is an irrational number which is less than infinity. It was however, William Jones, a mathematician from Wales, who first gave the Greek letter its current mathematical definition.