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    Pi Day
    Pi Day is an annual celebration of the mathematical constant π. Pi Day is observed on March 14 since 3, 1, and 4 are the first three significant digits of π. In 2009, the United States House of Representatives supported the designation of Pi Day. Wikipedia
    Celebrations: Pie eating, discussions about π
    Date: March 14
    Frequency: Annual
    Related to: Pi Approximation Day
    Significance: 3, 1, and 4 are the three most significant figures of π