A figure-8 (F8) is a type of swing in which the striker transitions between planes. A figure-8 is made up of two or more circular swings connected by a crossing. The type of swing is so named because the path of motion of the striker resembles the symbols for the number eight (8) or infinity (∞). In lissajous-do, the figure-8 is described as a ratio of circles. The basic figure-8 with a single rotation on each plane, for example, is called a 1:2.