Your Moon sign is the sign of the zodiac where the Moon was when you were born. In astrology, it makes up one-third of your primal triad. The Moon represents your emotions and your feelings and how you respond to the world around you and the people in it. There are 12 signs of the zodiac, each one with its own attributes and qualities. Since the Moon is in a particular sign when you were born, your emotions and feelings will reflect many of that sign's traits.