《周礼·夏官司马·虎贲氏&道右》
天子的弓连接九张弓而成一圆周，诸侯连接七张弓而成一圆周，大夫连接五张弓而成一圆周，士连接三张弓而成一圆周。
天子之弓，合九而成规，诸侯合七而成规，大夫合五而成规，士合三而成规。
The emperor's bow consists of nine small bows joined together in a circular shape, a feudal lord's bow consists of seven small bows joined together in a circular shape, a high official's bow consists of five small bows joined together in a circular shape, and a warrior's bow consists of three small bows joined together in a circular shape.