Offensichtlich gibt es einen
During such an event, pi celebrants may devise alternative values for π, eat pie, play piñata, drink Piña Colada, eat pineapple, listen to the song "Pi" by Kate Bush, or watch Pi. The shape of the pie is sometimes square, due to the pronunciation of the equation for the surface area bounded by a circle = πr2, i.e., "pie are squared." (
wikipedia )
Sympathisch ist, dass der Pi-Tag aus Kanada respektive von der Universität Waterloo kommt, die an diesem Tag den Studenten "pie" Kuchen verteilt. (via chiperoni)