"A pyramidion (plural: pyramidia) is the uppermost piece or capstone of an Egyptian pyramid or obelisk, in archaeological parlance. Speakers of the Ancient Egyptian language referred to pyramidia as benbenet and associated the pyramid as a whole with the sacred benben stone. 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. 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"." - (en.wikipedia.org 22.09.2019)
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