Eye of Sauron
- "But suddenly the Mirror went altogether dark, as dark as if a hole had been opened in the world of sight. . . In the abyss there appeared a single Eye that slowly grew, until it filled nearly all the Mirror. So terrible was it that Frodo stood rooted, unable to cry out or to withdraw his gaze. The Eye was rimmed with fire, but was itself glazed, yellow as a cat's, watchful and intent, and the black slit of its pupil opened on a pit, a window into nothing."
- ― The Mirror of Galadriel, The Lord of the Rings
The Eye of Sauron, called by many various names, was the symbol of Sauron the Dark Lord. This symbol was adopted to show his unceasing vigilance and piercing perception, and was displayed on the weaponry of his servants, or at least the orcs.
 Portrayal in adaptations
1995-8: Middle-earth Collectible Card Game:
- The card "Eye of Sauron" appeared in The Wizards (the first set for the game), used as to improve the prowess of each automatic-attack against other players. "The Lidless Eye" appeared in the set The Lidless Eye, and can be used by players to enhance their general influence.
2001-2003: The Lord of the Rings (film series):
- In Peter Jackson's film adaptation, the Eye featured as a physical, living object between the pinnacles of Barad-dûr. It also literally searched the lands with a red light like a spotlight, and in the film the light could be seen constantly sweeping the lands. It was quenched when the One Ring was cast into Orodruin.
2012-2014: The Hobbit (film series):
- In The Desolation of Smaug, the second installment of The Hobbit trilogy, the Eye of Sauron is shown, in which the pupil slowly becomes Sauron's shape as we have seen it in The Lord of the Rings (movies). Once we zoom into the Eye, we go through the pupil and see the Eye again, as an endless circle of the Void, portraying the 'window into nothing' out of Tolkien's description.