蚩吻，龍生九子第九子。 它屬水，可噴水滅火，在古代一般見於屋樑裝飾上， 在五行學中，水屬性可防火災。 除了屋樑上，也可見於古建築排水口，例如北京紫禁城建築群。
Chi Wen is the youngest son of the ancient dragon. In the five elements theory, it belongs to the water element. When we look in the pictures of Chi Wen, it is in the shape of a fish with a dragon head, has water coming out of its mouth.
Therefore, back in the old days, people started installing it on the rooftops, on one side as a decorations, on the other side, as a prevention of getting into fire, because they believe water element can destruct the fire energy.
Apart from rooftops, it can also be seen on drainage openings, for the same kind of meaning at the back.
