Leo, for example, is a term that can refer to a CONSTELLATION and a SIGN of the zodiac. The CONSTELLATION Leo is a group of stars located in the northern sky, visible in the night sky from late spring to early autumn. It is one of the 88 modern constellations and is represented by the symbol of a lion. The SIGN of Leo is one of the twelve signs of the zodiac, which is used in astrology to represent people born between July 23 and August 22.