"faces"
They are called faces.
A pyramid normally has flat faces
The flat surfaces on a pyramid are called faces. A pyramid has one base and triangular faces that meet at a single point called the apex. On a cube or rectangular prism, the flat surfaces are called faces as well. But unlike a pyramid, a cube has six square faces, while a rectangular prism has two rectangular bases and four rectangular faces.
A triangular based pyramid has 4 flat faces, 6 edges and 4 vertices.
the pyramid of giza.
The Cahokia civilization in North America is known for their flat-topped mounds.
A flat topped flower cluster is called a corymb or a cyme.
A flat topped mud brick tomb is called a mastaba.
Cyme
Unusual flat-topped seamounts in the ocean are called Guyots. Guyots are submerged volcanic mountains with a flat top that has been eroded by waves and currents over time.
The Great Pyramid of Giza originally had a flat, smooth casing of Tura limestone that covered the structure. However, this casing has weathered away over time due to various factors.
A flat-topped mountain is called a plateau. Plateaus are elevated landforms with a relatively flat top surface that are often formed by the erosion of surrounding land.
The flat-top pyramid is called a ziggurat.
The name of the flat top pyramid is called the ziggurat. They were not made by Egyptians however, they were made by the Mesopotamians.
We apply the term mesa to a flat-topped mountain.
plateau