Ra's eye is a spaceship formerly under command of Ra,and declared as the most powerful spaceship in his fleet for its time.
The ship was taken by Hathor. Her crew tested the drives an prepared an immediate invasion on Abydos. Hathor arrived at Abydos with the ship and destroyed two Tau'ri choppers. She landed the ship on top the Stargate to null the Tau'ri from escaping or bringing reinforcements. (Stargate: Rebellion 2) (Stargate: Rebellion 3)
The false Ra, Pharat-kah has a Ra's eye-class ship for his own fleet.