Mao Collection, Upper Volume Radical: Heart (xīn) Character: tong Kangxi stroke count: 15 Page 401, Entry 36 According to the Explaining Graphs and Analyzing Characters Long Annotations (Shuowen changjian), it is the same as the character tong (meaning to grieve or mourn). It is also written in a variant form (tong). The character tong was originally composed of the two parts tong and heart.