Shisui Uchiha

Shisui” (止水) alone means “still water” or “stagnant water”. Shisui is Kagami Uchiha’s “descendant” (子孫, shison), though their exact relationship is unknown. In the anime, Shisui’s Mangekyō pattern is depicted as a pinwheel of four spiralling curves instead of four points.

https://naruto.fandom.com/wiki/Shisui_Uchiha