Boris's sezration notation is a notation devised by Wiki user Boboris02 as an attempt to create a function that grows faster than any computable expression in the fast-growing hierarchy. The power of the notation beyond Upper Sezration is controversial, since many say it is nowhere near the bounds of the FGH. Neither beliefs have been proven right or wrong, since the Ultra-Sezration notation works in such a way that it's hard to compare to the FGH.