User blog comment:Ubersketch/Lexicographic ordinal notation up to the Bachmann-Howard ordinal/@comment-30869823-20190913225449/@comment-39541634-20190914214932

Sure, why not?

But I think PSS is simpler to understand and to work with, when compared to TON.

(though I won't be surprised if - at the bottom line - there's an easy isomorphism between the two notations up to the BHO, just like there's an easy isomorphism between PSS and a variation of Buchholz's OCF)