The term ZODIAC UNIT is composed of two words. The first word, 'ZODIAC', refers to the 12-part division of the sky into constellations, which is used in astrology. The second word, 'UNIT', refers to a single element or component of something larger. Together, the two words refer to one of the 12 divisions of the ZODIAC, with each UNIT representing a constellation. The SIGN for the ZODIAC UNIT is 'LEO', which is the fifth astrological SIGN in the ZODIAC and is represented by the constellation of LEO.