龜 (guī) is the Chinese word for "turtle" or "tortoise." These reptiles are known for their hard shells, which protect them from predators. Turtles are found in various environments, including oceans, rivers, and on land. They are part of the order Testudines and are characterized by their slow movement and long lifespan. In Chinese culture, 龜 is often associated with longevity and wisdom. The tortoise is one of the four sacred animals in Chinese mythology, symbolizing stability and endurance. Additionally, the I Ching, an ancient Chinese text, features the tortoise as a symbol of knowledge and guidance.