A Nine-Dragon Wall or Nine-Dragon Screen (Chinese: 九龍壁; pinyin: Jiǔ Lóng Bì) is a type of screen wall with reliefs of nine different Chinese dragons.
Such walls are typically found in imperial Chinese palaces and gardens.
Early reference to the tradition of putting a screen wall at the gate is found in the Analects, 3:22: therein, it is mentioned as a trivial ritual norm ("The princes of States have a screen intercepting the view at their gates".
邦君樹塞門, trans.
Nine-Dragon Walls in China: Outside China (partial):