Douglas Adams in his book Life, the Universe, and Everything (part of the Hitchhiker’s Guide trilogy) described a branch of mathematics known as bistromathics.
In it he described:
one of the most bizarre of mathematical concepts, a recipriversexclusion, a number whose existence can only be defined as being anything other than itself.
Diablomathics being very similar to bistromathics, that affix you’re trying to hit is none other than a recipriversexclusion I’m afraid.