It's hard to use AF, RLC (or REL), and EMP instead right? Oh, my bad, that would make too much sense and a second of thought about how to abbr. things is too hard.
Let's just go with that idiotic and misleading af1 (artifact weapon not artifact set), af2 (level 52 artifact armor piece), and af3 (level 54 artifact armor piece). Those are far less confusing and aren't terminology for completely different things.
Burden other people because you can't be bothered to use correct terminology.