Pi

For those with more Christian tastes, the so-called experts at Wikipedia have an article about Pi.

3.14159265358, or something like that.

Example of proper use of piEdit

Innocent civilian: (pi'd) HEY! WHO THREW THAT? THEY'RE SO GETTING A BRICK IN THE FACE!
Innocent tissue box: (sits there)
Innocent civilian: Oh, it was you, was it? Well! (Throws a math book at tissue box)