Pi Day is celebrated on March 14th (3/14) around the world.
Pi (Greek letter 
) is the symbol used in mathematics to represent a constant — the ratio of the circle’s circumference to its diameter. For any circle, the distance around the edge is a little more than three times the distance across.
Beauty In Numbers: Pi / 3.14 from Rebecka Taule on Vimeo.
UNESCO’s 40th General Conference proclaimed 14 March of every year International Day of Mathematics in November 2019. The International Day of Mathematics (IDM) is a worldwide celebration. The theme for 2020 was “Mathematics is Everywhere”