User blog comment:Edwin Shade/The Grand List Of Transfinite Ordinals/@comment-32213734-20171130020144/@comment-32876686-20171130021306

A significant ordinal is a subjective term I made up to cover basically all ordinals that are commonly used in ordinal mathematics and Googology, instead of random ones like $$\zeta_{{\epsilon_4+6}^{\Omega_5}}$$.