Zi Collection, Page Position: Upper, Radical: Knife (dāo), Page 22, Entry 05. "Nuan" is an incorrect form. The "Zi Hui Bu" (字彙補) annotates the pronunciation as "ni duan qie," which is read as "nuan." It means to contract or curl up. The term "zhua shou" (䎡首) appears in "Yangzi Tai Xuan Jing" (扬子·太玄经).