Philosopher Gilles Deleuze suggests that there's a one-of-a-kind sort of nonsense in the magic word abraxas: it is an immobilized "pure thought" and the "highest finality of sense," like a seemingly-nonsensical one-word simile, the paradoxical conclusion of an infinite regression of propositions (a is like b, and b is like c, and c is like d, and so on forever).  "There is only one kind of word which expresses both itself and its sense—precisely the nonsense word: abraxas" (Difference and Repetition [1995]).