images carved, drawn, or painted onto immovable rock surfaces.

Images on rock surfaces. There are two types of rock art: pictographs, which are drawn or painted onto the surface, and petroglyphs, which are pecked, incised, or abraded into the surface.

General term describing both pictographs and petroglyphs.

Nordic/Scandinavian Bronze Age rock carvings often depict boats or ships. What those boats looked like in reality nobody knows. Apparently they had oars but not sails. Perhaps they were similar to the Hjortspring boat.

Rock art is a term in archaeology for any man-made markings made on natural stone.