In the "Guangyun" (Guangyun), it is read as "kou huan" (level tone), and in the "Jiyun" (Jiyun), it is read as "ku huan" (level tone), with the same pronunciation as "fu" (fu). The "Guangyun" explains it as searing with a red-hot iron. The "Jiyun" offers another explanation, referring to branding with a red-hot iron to mark. Furthermore, in the "Guangyun," it is read as "ku guan" (level tone), and in the "Jiyun," it is read as "ku huan" (level tone), with the same pronunciation as "kuan" (kuan). The meaning is the same. Additionally, the "Guangyun" mentions "chuan feng" (chuan feng). The "Zilin" (Zilin) explains it as "chuan ke" (chuan ke). Nowadays, signing and marking at the seams of paper is called "chuan ke."