A drag lift. An overhead tow-line, usually around 4 meters above skiers and riders. It is known as a T-bar lift, with a T shaped bit which two skiers share by resting their bottom on the bar. It is known as a button or platter lift where the passengers place a circular disk in between their legs. More difficult and uncomfortable for snowboarders. drag_lift would also cover more simple looped rope drag lifts, or loops of wire with handles to grab.
This is just one classification among several cable/wire based lifts/transportation types listed under Key:aerialway. See also WikiProject Piste Maps
How to map
Draw a way along the route of the cable, and set this aerialway=drag_lift tag on this way.
This automatically implies oneway=yes (drawn upward).
Tags used in combination
Position nodes at either end of the cable. These nodes might be tagged with aerialway=station
If you know the position you can also map support pylons by positioning nodes in the middle of the way, with the tag aerialway=pylon.