(1). Tortoise and snake. The ancients often painted these two things on flags, thinking that they could eliminate disasters and avoid disasters. Zhou Li Chun Guan Chang Si: "Tortoise and snake are embarrassed." Zheng Xuan's note: "Tortoise and snake, if it is difficult to control." Jia "Gong Yanshu": "The turtle has armor, but it is difficult to overcome; A snake without armor is difficult to overcome. Avoiding people is also harmful. " According to the reporter's understanding, the king of Qing believed that "tortoise snake" should be a misunderstanding of "tortoise fork". "Participating in the same contract" volume: "The male is not alone, the mother is not alone, and Yuan Wu turtles and snakes help each other." Zhao Yanwei's Yunshan Pedestrian Banknote in the Song Dynasty, Volume 9: "The auspicious symbol, avoiding the taboo of the holy father, turned Xuanwu into a true martial art ... Later, they popularized the concept of ritual spring and got a tortoise and snake. Taoist thought Zhenwu was present, and he was painted as a god of the north, dressed in black, stepping on turtles and snakes with his sword. Since then, they have been more strict in service.
(2) the name of god. Namely Xuanwu.
(3) Guishan and Sheshan are also called. In today's Wuhan City, Hubei Province. Guishan is in Hanyang, Sheshan is in Wuchang, and the two mountains are across the river. In ancient times, Jianghan fortress was guarded by people. Wuhan Yangtze River Bridge is built between two mountains. Mao Zedong's "Water Turning Around" said: "The wind is moving, the tortoise and snake are quiet, and the future is great."