User blog comment:PsiCubed2/How to make Deedlit's Mahlo-level notation more intuitive/@comment-35470197-20180807000338/@comment-30754445-20180807005326

Not sure what you're "confused" about, when you got it exactly right.

My version basically unifies the two notations in Deedlit's blog post.

Note that in Deedlit's post, the I(whatever) expressions aren't actually part of his notation. He's just using it to explain how everything works. But technically, if we want to write "the first (1,0)-weakly inaccessible cardinal" in his notation, we must write it as χ(M,0) rather than I(1,0,0). In my version you can't really write I(1,0,0) either, but I(M2) is close enough.