Pi

The mathematical constant ? is the ratio of a circle's circumference (Greek ??????????, periphery) to its diameter and is commonly used in mathematics, physics, and engineering. The name of the Greek letter ? is pi (pronounced pie), and this spelling can be used in typographical contexts where the Greek letter is not available. ? is also known as Archimedes' constant (not to be confused with Archimedes' number) and Ludolph's number.

π culture

There is an entire field of humorous yet serious study that involves the use of mnemonic techniques to remember the digits of π, which is known as piphilology. See Pi mnemonics for examples.

Related Topics:
Mnemonic technique - Piphilology - Pi mnemonics

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March 14 (3/14 in US date format) marks Pi Day which is celebrated by many lovers of π.

Related Topics:
March 14 - US - Pi Day

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On July 22, Pi Approximation Day is celebrated (22/7 - in European date format - is a popular approximation of π).

Related Topics:
July 22 - Pi Approximation Day

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In the early hours of Saturday 2 July, 2005, a Japanese mental health counsellor, Akira Haraguchi, 59, managed to recite π's first 83,431 decimal places from memory, thus breaking the standing world record http://news.bbc.co.uk/1/hi/world/asia-pacific/4644103.stm.

Related Topics:
2 July - 2005 - Memory

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355/113 (~3.1415929) is sometimes jokingly referred to as "not π, but an incredible simulation!"

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