Pi Pie is a type of pie eaten on Pi Day and Pi Approximation Day. It is a way of celebrating the holiday, which is on March 14, because the date is 3/14, which could be interpreted as 3.14, the first 3 numbers of pi.
Pi Pies are usually decorated with numbers or symbols of pie with edible material. People like to eat this while talking about Pi.
- Pi Cake is sometimes used as a substitute for Pi Pie for people who either dont like pie, or are allergic to pie ingredients.