Wikipedia says, “A Pantomath is a person who wants to know or knows everything. The word itself is not to be found in common online English dictionaries, like the OED, dictionaries of obscure words, or dictionaries of neologisms. Logic dictates that there are no literal nonfictional Pantomaths. but the word Pantomath seems to have been used to imply a polymath in a superlative sense, a ne plus ultra (“nothing more beyond”) as it were, one who satisfies requirements even stricter than those to be applied to the polymath.”