The slab stela was an original form of the steles of ancient Egypt, but in a horizontal dimension. Some of the earliest ones from mid- to late-3rd millennium BC were painted Slab Steles. A small list of Ancient Egyptian dignitaries or their wives had a Slab stela.
Some funerary stelas were in the form of slab steles, as opposed to being the more common vertical stele.
At the same time period of the middle 3rd millennium BC and later, some famous horizontal lintels were made. Hemon-(Hemiunu), the noted architect had one; it is housed in the Pelizaeus Museum of Germany. The horizontal archaeological lintel was used in other cultures in ancient times, for example in the mesopotamian cultures.