A pyramidion (plural: pyramidia) is the uppermost piece or capstone of an Egyptian pyramid or obelisk.[1] Speakers of the Ancient Egyptian language referred to pyramidia as benbenet[2] and associated the pyramid as a whole with the sacred benben stone.[3] During Egypt's Old Kingdom, pyramidia were generally made of diorite, granite, or fine limestone, then covered in gold or electrum; during the Middle Kingdom and through the end of the pyramid-building era, they were built from granite.[4] A pyramidion was "covered in gold leaf to reflect the rays of the sun"; during Egypt's Middle Kingdom pyramidia were often "inscribed with royal titles and religious symbols".[3]