User blog comment:Googleaarex/My number is bigger! (Googology Wiki version)/@comment-2033667-20140919220815/@comment-25371339-20140921134510

In n-order set theory, we have the variables x, xx, xxx, up to xxx...xx and the variables xxx...xxx', xxx...xxx'', xxx...xxx, xxx...xxx', etc. The xxx...xxx variables are (n-2)-ex-collections of classes, where an n-ex-collection of classes is equal to a collection of collections of collections of...of collections of collections of collections of classes, where you say collection n times.