Oblivion is a large googolism coined by Jonathan Bowers.[1] It is defined as "the largest number defined using no more than a kungulus symbols in some K(gongulus) system", where a "K(n) system" is a "complete and well-defined system of mathematics that can be described with no more than n symbols". It is claimed to be larger than Rayo's Number, BIG FOOT and by extension Little Bigeddon, whom he speculates to be something like K(10,000) systems. It is allegedly the second-largest number Bowers has defined, only smaller than Utter Oblivion. Kungulus is comparable to $$f_{\Gamma_0}(100)$$ in FGH, and gongulus is comparable to $$f_{\omega^{\omega^{100}}}(10)$$, both are much larger than googol, so Oblivion would be much larger than Rayo's number if it were properly defined.