Chen Collection, Middle Volume. Radical: Tree (mù). Character: Lei. Kangxi strokes: 17. Page 556, Entry 28. According to the Sound Dictionary (Jiyun), pronounced lei. The name of a type of tree. Also, according to the Classified Chapters (Leipian), it is the same as the character for a stone used in defense. According to the Pi Cang dictionary, it refers to pushing stones down from a high place. It is also written as the character for thunder. According to the commentary on the Rites of Zhou (Zhouli), Autumn Offices, Official of Gold, it is an instrument used for defending a city. Also, in the Rhapsody on Sir Fantasy (Zixu Fu) by Sima Xiangru, it describes stones colliding with one another.