User blog comment:Edwin Shade/You Know You're a Googologist When.../@comment-11227630-20171014160901

Here's my classification: And what's the next "larger" concept in googology?
 * Googology level 1: numbers and operations (e.g. hyperoperators, Graham)
 * Googology level 2: ordinals (e.g. BAN, ExE, FGH)
 * Googology level 3: languages (e.g. Rayo, FOOT)