Rinne Sharingan

The is the progenitor of the Rinnegan and Sharingan. It is characterised by a ripple-like pattern which spreads over the eyeball, with red sclerae and irides, containing nine tomoe.

Background
This dōjutsu was first manifested by Kaguya Ōtsutsuki as a third eye on her forehead after eating the Shinju's fruit, and later by the Ten-Tails, the combined entity of Kaguya and the Shinju. Madara Uchiha, after retrieving both of his own Rinnegan and approaching the moon, awakened this dojutsu in his own forehead, allowing him to cast the Infinite Tsukuyomi. As a result of Black Zetsu's actions, Madara's body then served as a vessel for the resurrected Kaguya, who retained the Rinne Sharingan in her third eye.

Abilities
The Rinne Sharingan possesses the ocular power of the Sharingan, and can be used to cast the Infinite Tsukuyomi, a powerful genjutsu which can only be countered by the Rinnegan. Using this dōjutsu, Kaguya can also teleport herself and others to a series of alternate dimensions.

Trivia

 * The kanji is also used in Rinnegan and Sharingan, potentially linking the three terms etymologically.
 * The Infinite Tsukuyomi, despite only being cast by the Rinne Sharingan, has been referred to by Sasuke Uchiha as a genjutsu of the Rinnegan. However, the distinction between the Rinnegan and Rinne Sharingan was made clear in the Fourth Databook.
 * Despite not possessing the Rinne Sharingan, Obito Uchiha was able to almost start the Infinite Tsukuyomi by manifesting the Ten-Tails outside of his body as its jinchūriki.