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[[Image:Pi pie2.jpg|thumb|right|Pi Pie at [[Delft University]]]]
'''Pi Day''' or '''Pie [[Estimation|Approximation]] Day''' is a day when people around the world celebrate the number [[Pi (mathematical constant)|pi]]. They also eat [[pie]] to celebrate the [[pun]] as both words sound the same. Pi Day is held on March 14.

==History==

On Pi Day 2004, Daniel Tammet [[wikt:recite|recited]] 22,514 decimal digits of [[Pi (mathematical constant)|π]].<ref>Bank, Alan (March 13, 2009). "[http://www.dailypilot.com/articles/2009/03/14/topstory/dpt-piqueen03142009.txt Pi Queen holds throne]", ''[[Daily Pilot]]''. Retrieved 2010-03-14.</ref>

On March 14, 2010, [[Google]] made a sign celebrating Pi Day, with the word ''Google'' laid over images of circles and  nothing else but pi symbols

== References ==
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[[Category:Mathematical constants]]
[[Category:March observances]]