The Eye of Sauron, or Great Eye, was a symbol adopted by the Dark Lord in the late Second Age. It was said that few could endure its terrible gaze. The Eye was used as a symbol on armor and banners of Mordor, representing Sauron's quasi-omniscience.
With it, Sauron searched for and tracked the paths of the Ring-bearer Frodo Baggins at the end of the Third Age.
Thanks to everyone (all 764 of you) for your participation in this šļø Eyes šļø challenge hosted in the Mesmerizing chatroom. I really enjoyed your wide variety of beautiful, expressive, and uniquely stylized depictions centered around these body parts. I hope you all an enjoyable time. We'll get around to setting up another game momentarily.