There are three astrological qualities: cardinal, fixed and mutable. Each of the 12 Signs of the Zodiac falls into one of these three categories.
Cardinal Signs
Aries, Cancer, Libra and Capricorn The cardinal quality is the active, initiating principle. Those born under these four Signs are good at starting new projects.
Fixed Signs
Taurus, Leo, Scorpio and Aquarius Fixed qualities include stability, persistence, endurance and perfectionism. People born under these four Signs are good at seeing things through.
Mutable Signs
Gemini, Virgo, Sagittarius and Pisces Mutable qualities are adaptability, changeability and balance. Those bom under these four Signs are creative, if not always practical.