The term Pyramid refers to a solid three-dimensional structure with a polygonal base and has triangular outer surfaces. These triangular faces meet at a common point which is either called a vertex or apex. The animation of a spinning pyramid is similar to a tetrahedron. The term pyramid also refers to the huge monuments of Egypt which have a rectangular base and four triangular faces rising to a single point, which are usually built over or around a tomb. The term also may refer to a variety of similar construction, like a four-sided Mayan temple and the ziggurats of the ancient Assyrians and Babylonians.
One prominent example of a pyramid of architectural importance is: Great Pyramid, El Giza, Egypt, which is also known as "Pyramid of Cheops" or "Khufu's Pyramid" built in 2600-2480 BCE. The Great Pyramid made of cut stone is 756 feet square in plan, and 481 feet in height. The base of the pyramid is about 13 acres. The Great pyramid is extremely large prism only one of its kind in world architecture. It took about 2,300,000 dressed stone blocks which weighs about 2.5 tons each to build the Great Pyramid. It is one among the Seven Wonders of the Ancient World.