A number having no end. Pi is proof of an immortal mathematical phenomena and that a phenomena can have no end. If Pi is a never ending number than it has endless data and the true number of Pi cannot be stored in any computer or memorized by any brain (except by the brain of God).
And just for kicks
3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067982
3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067982
Get the pi mug.