1. Zi is a Chinese character, the pinyin is zǐ, which refers to a deciduous tree; to make wooden utensils; to carve wood into a printing plate; to refer to hometown; to have a surname. From "Poetry·_Feng·Dingzhifangzhong".
2. Explanation of ancient books: "Kangxi Dictionary", "Tang Yun" is Li Qie's "Ji Yun", "Zheng Yun" Zu Siqie, "Yun Hui" Zu Shi Qie, "Shuowen" Catalpa Ye. Or as _. "Tongzhi" catalpa and catalpa are similar. "Erya Shimu" chair, Zi. "Guo Zhu" is catalpa. "Lu Ji·Sparse Grass and Trees" Catalpa trees that are sparse and white in color and give birth to children are Catalpa trees. "Piya" Zi is a hundred trees long, so Zi is called the King of Wood. Luo Yuan said: If there is this kind of wood in the house, the rest of the wood will not shake.