User blog:Ubersketch/An unconventional form of recursion

In Fast Iteration Hierarchy: S(a){#_1[Ξ]b,#_2} = S(a){#_1[S(a){#_1,#_2}]b,#_2} S(a){[Ξ]b} = a Now what ordinal separator does this separator correspond to? Also I've only seen this hind of recursion in intentional salad numbers like so: Result of last step is X. Start with 0. 1. X+1 2. Y+X where Y is this salad number without this step. 3. X^10^100 ...