Every March 14th, Pi Day is celebrated to commemorate the date's connection to the mathematical constant pi (3.14). Pi represents the ratio of a circle's circumference to its diameter and is an important value across many fields including statistics, finance, engineering, and medicine. The modern tradition of celebrating Pi Day began in 1988 when a physicist organized the first official celebration, which involved eating pie in acknowledgment of the numerical coincidence between "pi" and "pie". Now common ways to mark the day include enjoying pie-flavored desserts and wearing apparel featuring the symbol of pi.