Pi
From Frikipedia
Mmmm....pi....
3.142...... something. Oh like you know it any more than that.
It can be used for several reasons, including confusing James Allen to distract him from Button, his fiancee` (which is extremly unlikely), converting from degrees to radians and other mathematical purposes we are sure you won't bother wanting to know about. It is an irrational number.
