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Some many be astronomical markers, maps, and other forms of symbolic communication, including a form of proto-writing.Petroglyph maps may show trails, symbols communicating time and distances traveled, as well as the local terrain in the form of rivers, landforms, and other geographic features.According to these theories it is possible that the similarity of petroglyphs (and other atavistic or archetypal symbols) from different cultures and continents is a result of the genetically inherited structure of the human brain.Other theories suggest that petroglyphs were carved by spiritual leaders, such as shamans, in an altered state of consciousness, perhaps induced by the use of natural hallucinogens.The vertical relief is most common, but reliefs on essentially horizontal surfaces are also found.The term relief typically excludes relief carvings inside natural or human-made caves, that are common in India.Some of these reliefs exploit the rock's natural properties to define an image.Rock reliefs have been made in many cultures, especially in the Ancient Near East.

Both types of image belong to the wider and more general category of rock art or parietal art.Siberian inscriptions loosely resemble an early form of runes, although no direct relationship has been established. Petrogylphs from different continents show similarities. While people would be inspired by their direct surroundings, it is harder to explain the common styles.This could be mere coincidence, an indication that certain groups of people migrated widely from some initial common area, or indication of a common origin.Natural rock formations made into statues or other sculpture in the round, most famously at the Great Sphinx of Giza, are also usually excluded.Reliefs on large boulders left in their natural location, like the Hittite İmamkullu relief, are likely to be included, but smaller boulders described as stele or carved orthostats.

Later glyphs from the Nordic Bronze Age in Scandinavia seem to refer to some form of territorial boundary between tribes, in addition to possible religious meanings.