Mao Collection, Upper Volume Radical: Heart (xīn) Character: Lou Kangxi stroke count: 15 Page 401, Entry 07 Ancient form. Pronounced lou. Meaning: joy. Also, lou lou, the appearance of being respectful and cautious. Also, the meaning of being diligent and earnest. From the Biography of Yang Ci in the History of the Later Han (Houhan Shu): How could I dare to cherish the remaining years of my twilight, and not exhaust my sincere heart? Pronounced lou. The meaning is the same. Pronounced lü. Surname. From the Zuanwen.