Draw a circle with a diameter (all the way across the circle) of 1 Then the circumference (all the way around the circle) is 3.14159265... a number known as Pi Pi (pronounced like "pie") is often written using the greek symbol π of a Circle.
"A slice of pi: An exploratory neuroimaging study of digit encoding and retrieval in a superior memorist". Neurocase. 15 (5): 361–372. doi: 10.1080/13554790902776896. PMC 4323087. PMID 19585350. ^ Keith, Mike. "Cadaeic Cadenza Notes & Commentary". Archived from the original on 18 January 2009. Retrieved 29 July 2009.
In the Palais de la Découverte (a science museum in Paris) there is a circular room known as the pi room. On its wall are inscribed 707 digits of π. The digits are large wooden characters attached to the dome-like ceiling.
Pi: The Next Generation, A Sourcebook on the Recent History of Pi and Its Computation.