Pronounced ya (entering tone) — "Tang Yun" (Tang Yun) notes pronunciation as yi jue qie. "Ji Yun" (Ji Yun) notes pronunciation as yi xia qie, pronounced ya (entering tone). "Shuowen Jiezi" (Shuowen Jiezi) explains it as the sound of a door opening. "Guang Yun" (Guang Yun) explains it as the appearance of a door leaf opening. Han Yu's "Zheng Shu Lianju" (Zheng Shu Lianju) contains the line "ruo die he xiao xi, jue men ya ao kai." Additionally, "Ji Yun" (Ji Yun) and "Yun Hui" (Yun Hui) note pronunciation as yi xia qie, pronounced ya (entering tone), with the same meaning.