A "mod component", like a partial mod or a very limited mod. I was referring to your mod as such because it could easily be imported into another mod, since it only affects one single aspect of the game.
You could make your own mod simply by combining existing mod-comps into a new whole. It wouldn't be original and you wouldn't be able to take credit for much of anything, but it would still, potentially, be a unique combination of mod-comps and thus a unique mod.