I'm getting old and forgetful.
Everyone here knows the difference between theorem, corollary, lemma, proposition, conjecture, axiom, and postulate.
I once heard another one, a Latin term, that IIRC meant something like "illustrative example." The only example I ever found of it being used was from Euler.
It may be rare, but I like having a complete list. Can someone help me out and remind me what this mathematical term is?