The term 'Dark Half' is a reference to the yin and yang concept, which is an ancient Chinese philosophy that states that two opposite forces are interconnected and interdependent in the natural world. The yin is the dark half, representing the feminine, passive, and negative aspects of life, while the yang is the light half, representing the masculine, active, and positive aspects. The crossword solution for the term 'Dark Half' is 'YIN, ' which is a three-letter word that represents the dark half of the yin and yang concept.