Yin-Yang and Five Elements: Hai (亥) belongs to Yin Water (conceals Ren Water as the main Qi), internally contains Jia Wood, with characteristics of hidden currents and growth.
Month and Direction: Corresponds to the tenth month of the lunar calendar (Beginning of Winter month), direction is north by west, Five Elements number 1/6.
Zodiac Correspondence: Represents the Pig in the twelve zodiac animals.
Hidden Stems Characteristics: Internally hides Ren Water/Jia Wood, functioning as an "energy transformation system of hidden currents in the Milky Way."
Special Relationships:
Six Conflicts: Si (巳) and Hai (亥) conflict
Six Harmonies: Yin (寅) and Hai (亥) harmonize
Three Harmonies: Hai (亥), Mao (卯), and Wei (未) form a Wood trine
Three Meetings: Hai (亥), Zi (子), and Chou (丑) meet in the northern Water