Happy Pi Day! Geeks everywhere unite to celebrate this yearly mathematical holiday.

Pi, also known by its Greek letter π, represents the ratio of a circumference of a circle to its diameter. Numerically Pi is 3.14159265358979323846264338327950...with the digits going to infinity. Yearly π is celebrated on March 14 (3/14) because it's the most recognizable digits of the mathematical symbol.

So eager to celebrate this math enthusiast's holiday? Here are some suggestions to help you do that.

Pi Themed Pie

What better way to celebrate Pi Day then with a delicious pie? You can make a pi shaped pie or carve the symbol into your crust. Either way here are some great pie recipes.

Recite the Pi Digits

How many digits of pi can you recite? Chao Lu from China holds the world record for reciting the most digits of pi. He can recite 67,890 digits of pi! Challenge your friends to see if you can beat Lu's record.

Watch Pi the Movie

Cozy up with a slice of pie and a copy of Pi the movie. Written, directed, and produced by Darren Aronofsky the movie is about a paranoid mathematician searches for a key number that will unlock the universal patterns found in nature, according to IMDb. Sounds exciting. This psychological thriller came out in 1998.