Zi Collection, Page Position: Upper, Radical: Heart (xīn), Page 101, Entry 01 Pronounced yu (falling tone) according to "Jiyun" and "Yunhui", and niu (falling tone) according to "Wuyin Jiyun". The pronunciation is the same as "yi". "Shuowen Jiezi" explains it as "to punish" or "to warn". The character's structure is from the Heart radical, with "yi" serving as the phonetic component. According to the "Book of Jin: Treatise on Geography" (Jinshu Dìlǐzhì), when Qin Shi Huang first unified the empire, he "punished and warned against the ills of the Warring States period" (chéng niè Zhànguó) and abolished the system of enfeoffment. Furthermore, according to "Jiyun", "Yunhui", and "Zhengyun", it is pronounced niu (falling tone) and has the same pronunciation as "ai". The meaning is also the same.