"RBA" encompasses all rebuildable atomizers... meaning the user builds their own coil(s) and fits their own wick. From that, there are "genesis" tanks... which is kinda like a RDA on top of (and sometimes under) a juice tank.
There's the RDA or rebuildable dripping atomizer, which is a build deck with 2 or more coil posts, a juice well of varying dimension and a top cap to concentrate the vapor. Finally, there is the RTA, which is the rebuildable tank atomizer, and closest to a clearo or glassomizer.
There is also a "carto tank" which holds both a cartomizer (disposable wick and coil in a tube) and the juice surrounding it.