Tomoe

A tomoe or tomoye (archaic) (巴) is a Japanese abstract shape (i.e. a swirl) that resembles a comma or the usual form of magatama. Tomoe are usually seen in a design of three known as.

They appear in the Sharingan, and they also form the Cursed Seal of Heaven which Orochimaru put on Sasuke Uchiha and Anko Mitarashi. It has also appeared in the Ten-Tailed Beast going in three seperate orbits around the pupil. Orochimaru also summons a three headed snake who has tomoes on it's head.