This symbol represents a heart. The Egyptian believed the heart was the center of all consciousness, even the center of life itself. It was the only organ that was not removed from the body during mummification. In the Book of the dead , it was the heart that was weighed against the feather of Maat to see if an individual was worthy of joining Osiris in the afterlife. In this case it probably represents the entrance to the underworld.
Pylons are the largest and least essential parts of a temple that is usually built last.
Some temples have more then one set, the temple at Karnak has 10 Pylons. Feather of Maat Represents truth, justice, morality and balance. It was pharaoh's job to uphold Maat. When a pharaoh died, Maat was lost and the world was flung into chaos, only the coronation of a new pharaoh could restore Maat . Menhed A scribes pallet.