A PYRAMID, Perhaps is a type of ancient structure that was used as a TOMB. It is typically characterized by its four triangular sides and a square base. The term 'PYRAMID' is derived from the Greek word 'pyramis' which means 'wheat cake'. Pyramids were built in many parts of the world, including Egypt, Mexico, and Central America. The most famous pyramids are the Great Pyramids of Giza in Egypt, which were built around 2560 BC.