User blog comment:GamesFan2000/Factor-Multiple Function (FMF)/@comment-35434595-20181121230612/@comment-30754445-20181121233750

...with the "ω" being entirely due to use of Knuth arrows. The notation itself manages to perform exactly one additional level of recursion.

This may or may not matter, depending on the goal GamesFan2000 had in creating his function.

EDIT:

@P-bot: One can prove by transfinite induction that every ordinal is around every other ordinal ;-)