In "Tang Yun" and "Ji Yun", the pronunciation is noted as chou (丑) ying (郢) cut, with a sound similar to "cheng". "Shuowen Jiezi" explains it as equipment for driving a chariot. "Yupian" explains it as equipment for riding a horse. Also, in "Ji Yun", the pronunciation is noted as zhi (直) ji (几) cut, with a sound similar to "zhi". The meaning is the same. Also, in "Guang Yun", the pronunciation is noted as chou (丑) shan (善) cut, and in "Ji Yun", it is noted as chou (丑) zhan (展) cut, with a sound similar to "zhan". The meaning is the same. Furthermore, "Ji Yun" explains it as a tool for collecting silk.