March 14 — or 3/14 — is known as Pi Day!

Happy Pi Day! No, not pie day (although that would be delicious). March 14th is Pi Day — a special math day to celebrate a very unique number. Read on to learn more!

What is pi?

Pi, or 3.14159265 … (the three dots after the number mean there's much more) goes on and on to infinity (that means never ending) and beyond!

With trillions of digits, most people just round it to 3.14. Or they write it as a symbol π — like a nickname! π is pronounced “pi” like the pie we eat, but it’s definitely not as tasty.

So why is Pi Day on March 14th?

Look at the date: March 14.

March is the 3rd month of the year, and that day is the 14th of the month. Put them together and you get (drumroll please) 3.14, or pi!

Now that you know what pi is, let’s have a look at a few fascinating facts about pi.