The Benben stone is an object that is found in the mythology of ancient Egypt. This mythical stone is said to have once been housed in a shrine within the compounds of the temple dedicated to the deity Atum in Heliopolis. The Benben stone is also an architectural term, and is the name given to the tip of an obelisk or the capstone placed on top of a pyramid.
In the temples, the benben was also represented by the bier, with a mound of sand, upon which the statue of the deity was placed after being taken out from its shrine. This represented the emergence of Ra-Atum (or other Gods equated with him) from the primordial waters upon the benben to create the world.
The benben was also called Tatanen, in such cases associated with the God Ptah from Memphis.
In the temples, the benben was also represented by the bier, with a mound of sand, upon which the statue of the deity was placed after being taken out from its shrine. This represented the emergence of Ra-Atum (or other Gods equated with him) from the primordial waters upon the benben to create the world.
The benben was also called Tatanen, in such cases associated with the God Ptah from Memphis.
I stongly suspect the original benben was a meteorite judging by its shape, they became cult objects in other places too (Cyprus, thr Kaaba,...)