Akatsuki is a criminal organization within the fictional world of Naruto series. The group is posed as a main opposing force and villain of the original series, whose plans involve essentially the destruction of world. Their design and motives made them very popular among the fans.
The main Akatsuki emblem has always been a red cloud with thick white lines and maroon outlines. There are three spiral lines inside the figure, as well as a sharp tail on the (usually) left end of the wisp. This symbol symbolizes the rain of blood, a concept taken from the history of the Naruto world.