Six evils is a term in Feng Shui, which represents a relationship between the twelve earthly branches. The six evils are generally unlucky.
Extended
Four-pillar numerology (eight characters) and Feng Shui terminology. Represents a relationship between the twelve earthly branches. The master summarizes it as follows: Zi Wei harms each other, Chou Wu harms each other, Yin Si harms each other, Mao Chen harms each other, Shen Hai harms each other, and Youxu harms each other. The six evils are generally unlucky.