Pronounced suǒ (falling tone) in Guangyun and sǔn suǒ (falling tone) in Jiyun, with the same pronunciation as "suǒ". Guangyun records it as the name of a type of bamboo. It also refers to a mat. Boya records that "sù sù" is a mat. Another explanation refers to "sù". It also refers to Suren, which was a county name in the Han Dynasty. It is written as "shěn" in Hanshu. It is written as "sù" in Kuodizhi.