User blog comment:Kochab1/Googology memes/@comment-80.98.179.160-20171114124003

That last meme explains all. As tgere's always a larger number: FOOT10(Rayo10(Ξ10100(Σ(trimentri)))), where
 * FOOT is 1st order oodle theory function,
 * Σ is Busy Beaver,
 * Ξ is Xi function,
 * Ξn is as explained in Xi function,
 * Rayo is Rayo's function.