"Pi Day is celebrated on March 14th (3/14) around the world. Pi (Greek letter “π”) is the symbol used in mathematics to represent a constant — the ratio of the circumference of a circle to its diameter — which is approximately 3.14159. Pi Day is an annual opportunity for math enthusiasts to recite the infinite digits of Pi, talk to their friends about math, and to eat Pie." - PiDay.Org

And then there are those that take infinite digits to new levels.

However you celebrate - be it in a STEM-based activity in your classroom or just eating pie - may your Pi Day be a happy one.