Rob - The "three point" part just refers to the mount. All tillers are three-point-hitch mount, except the hydraulic-powered ones for skid steers, which use a universal mount standard to skid steers.
The "rotary" part refers to the way the tiller works. It has a shaft running horizontally, with the tines that break up the soil attached to it - you've seen them, I'm sure.
So, the ones that were being discussed here were all "rotary" tillers and, since they're for three-point hitch tractors, they're all three-point hitch rotary tillers.
Mine is in the process of being converted to a skid steer mount, but that's another story... /w3tcompact/icons/smile.gif
Does that answer your question?