What is the emblem of pharaonic kingship and Isis, represented by an Egyptian cobra?

The emblem of pharaonic kingship and Isis represented by an Egyptian cobra is known as the Ureus. The Ureus symbolizes sovereignty, ideal for both divine and royal authority in ancient Egypt. It is often depicted as a rearing cobra and was commonly worn as a crown upon the forehead of pharaohs, denoting their role as both a ruler and a protector. This imagery underscores the belief that the pharaoh had the divine right to rule, as encapsulated by the protective and aggressive nature of the cobra, which was seen as a symbol of protection against enemies.

The other options do not represent the specific emblem associated with pharaonic kingship and Isis. The Ankh symbolizes life and longevity, the Sphinx is a mythical creature often associated with wisdom and guarding, while Papyrus is a plant that was used for making paper-like material vital in ancient Egyptian writing and documentation but does not have the same connotations of rulership or divinity as the Ureus.