The trackball, a related pointing device, was invented in 1946 by Ralph Benjamin as part of a post-World War II-era fire-control radar plotting system called Comprehensive Display System (CDS).
轨迹球也是一种相关的指向设备，1946 年，拉尔夫·本杰明发明了轨迹球，当时是用在二战后的一种叫“综合显示系统（CDS）”的火控雷达绘图系统上。