Mao Collection, Upper Volume Radical: Heart (xīn) 怡 Kangxi strokes: 9 Page 381, Entry 16 Pronounced yí. Erya, Explanation of Words: Joyful. Shuowen Jiezi: Harmonious. Yupian: Happy. Book of Rites, Inner Requisites: Lower the breath and assume a pleasant expression. Analects of Confucius: The brothers are harmonious and joyful. Also a surname. Zhou Yifeng, originally surnamed Mehe, changed it to avoid disaster. Also written as a variant form (tái). Records of the Grand Historian, Preface and Biography: The various Lu family members were not tai, meaning they were not a source of joy or pleasure to others.