The symbol and the number denoting the ratio of the circumference of a circle to its diameter. A transcendental number having a value to eight decimal places of 3.14159265.

Articles on that refer to Pi

Singularity Math Trialogue By Ray Kurzweil, Vernor Vinge, and Hans Moravec
The Computational Universe By Seth Lloyd
Reflections on Stephen Wolfram's 'A New Kind of Science' By Ray Kurzweil
The 10% Solution For A Healthy Life, Chapter 13: How to Eat Revisited By Ray Kurzweil
How To Make a Nanodiamond By Robert A. Freitas Jr.

News Articles that refer to Pi

Drexler vs. Smalley on molecular assembly
Darpa: Heat + Energy = Brains. Now Make Us Some.
Software That Organizes Intelligently
Graphene gazing gives glimpse of foundations of universe
Inside the Savant Mind: Tips for Thinking from an Extraordinary Thinker

Related Links

A History of PI
PI and Fibonacci Numbers