What serpent symbol appeared on the pharaoh's crown?

The story behind the answer

Uraeus is correct: it’s the rearing cobra emblem mounted on the pharaoh’s crown, embodying the goddess Wadjet of Lower Egypt. As a symbol of royal authority and divine protection, the Uraeus was believed to spit fire at the king’s enemies. It appeared on diadems, the Nemes headcloth, and the Double Crown, often paired with the vulture of Nekhbet (Upper Egypt) to signify unified rule.

Remember it this way: Uraeus sounds like “you raise” a cobra—exactly what the symbol depicts on the pharaoh’s brow. By contrast, the Khepresh is the blue war crown, and the Nemes is the striped headcloth