Capstone or pyramidion
The answer depends on which pyramid. Geometrically, one stone makes a pyramid - a trivial one. Four make a proper pyramid.
small pyramid on topAdded: The capstone.
A pyramid shaped stone known as the cap stone or pyramidion. It was usually made from granite and sheathed in gold. None survive today being covered in gold meant they were obvious targets for thieves.
The great pyramid.
Capstone or pyramidion
capstone
The 'capstone' or 'pyramidion'.
An Obelisk.
What is placed on the top is a peace of stone in the shape of a smaller pyramid with a thin layer of gold on the peace this peace is called the alabaster.
obelisk
An obelisk is a rectangular column ontop of a pyramid
A stone pyramid
It is the keystone.
Well if the top it pointed i would call it a pyramid.
Go 2 the top of the pyramid and use the moonstone
well to make a pyramid Egyptians had to use an inclined plane and role a huge stone up the inclined plane, the Egyptians would continue this concept until they reached the top stone.