When Is National Pi Day 2024. 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. National pi day will see miraculous offers from taco bell, papa john’s, blaze pizza, doordash, and others on thursday, march 14.
By staff • published march 11, 2024 • updated on march 12, 2024 at 4:47 pm. Pi day is celebrated on march 14th (3/14) around the world.