snark
Pronunciation: /snärk
noun
An imaginary animal (used to refer to someone or something that is difficult to track down).
Origin
1876: nonsense word coined by Lewis Carroll in The Hunting of the Snark.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
With no intention to be flippant, I admit, I've never seen a snark. Then again, I've never seen a unicorn either. That does not mean I'll stop looking. Imagine that!