Top and bottom coil clearomizers and glassomizers (which are fancier, glass tanked clearomizers). Same again... but with dual coils. The coil head assemblies are replaceable... and many are DIY rebuildable with your own wire and wick (see wick below).
Carto tanks. A plastic or glass tank, with aluminum, plastic, SS or rubber end caps - that hold cartomizers with holes in them so juice can transfer from the tank to the carto wicking material. Single and dual coils.
RTAs. Rebuildable tank atomizers. A somewhat new designation... previously fell under the RBA umbrella. Similar to a modern glassomizer, but must be built by the user. Single and dual coil designs... wicks of ceramic, SS mesh and cable, silica, hemp, bamboo and cotton.
Genesis atomizer. A tank with a wick going up into what amounts to a variation of a RDA - rebuildable dripping atomizer. The original idea was to have an RDA with a juice supply.
All but the last, with a few exceptions, are "
pressure differential" type atomizers.