Minor Yin (少阴) is one of the Four Phenomena in Chinese metaphysics. It stems from the principle of Yin and Yang, where neither can exist without the other. Minor Yin represents the smallest portion of Yin energy, co-existing within Major Yang. It is associated with the White Tiger, the West direction, and the season of Autumn. This concept is essential for understanding the dynamic balance and interactions of energies in the natural world.