The Greek letter π (pronounced "pie") is the symbol ("pi") used in mathematics to represent a constant. The number for the ratio of the circumference of a circle to its diameter is approximately 3.14159.
Pi Day is an annual celebration of that mathematical constant π and is observed on March 14. Why? Because 3, 1, and 4 are the first three significant figures of the math sequence. In 2015, March 14 was celebrated as "Super Pi Day," since 3.1415 is a longer chunk of that number sequence, which is shown in the next illustration as 3.14159265359.
It's not pizza pie day or pumpkin pie day, but you can have one (or both) to celebrate the day, if you'd like. I think that sounds like a great idea, myself.
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We celebrated at my naturalist group meeting, and I hope to post about it soon.
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