abbreviation? what? Nothing is being abbreviated anywhere.
you wrote “appeal prove”. That doesn’t make any sense. “Prove” is the wrong word. The correct word is “proof”.
Specifically, prove is a verb. A doing word. You prove things. Like walk, or run. But things cannot have or be “prove”. I walk down the road. I prove my case.
Proof is either a noun or an adjective, depending on which word of it you use. In this instance, proof means resistant. Like waterproof speakers.
edit: and to add, I hyphenated appeal-proof because appealproof isn’t a word. Perhaps you confused hyphenation with abbreviation somehow?