What does Yuan Gui mean?

Turtles were used for divination in ancient times.

Yuan Gui's explanation is a metaphor for the past, referring to one of the four treasures (Yuan Gui, Gong Gui, Hou Gui, Zi Gui) of the counselor, Wang Mang Coin and Gui Wen. From "The Book of Gold", "Historical Records of the Turtle Biography" and so on. Yuan gui is an animal belonging to the genus Trionyx (yuan gui). Its carapace is oval, and the boundary between the bone plate and the skirt is obvious.