A rare, intact capstone of a pyramid, a pyramidion, dating back to the 19th century BC, during the reign of Amenemhat III.
This pyramidion sat on top of the so called Black Pyramid. As seen on this image, the rest of the pyramid has not fared equally well.
Wikipedia on the pyramidion
Oh wow. That is really neat. I would love to go see the museums in Egypt. I saw the small mummy exhibit at the Smithsonian Natural History Museum and it was amazing.
It’s preserved remarkably well. I wonder what the symbols mean