Pyramid

A pyramid is a three dimensional structure composed of four sides composed of (usually) triangular shapes.

The Osirans influenced the building of the Egyptian pyramids on Earth, and some other pyramids were definately constructed by 'aliens'. (DW: Pyramids of Mars, BNA: Dead Romance)

The Exxilons also influence not only the Egyptian, but also the Aztec pyramids during thier visits to Earth. (NA: The Left-Handed Hummingbird)