Quadruplicity

The set of four signs with the same quality, either Cardinal, Fixed, or Mutable. These groups are formed by taking the first, second and third sign from each of the four quadrants of the zodiac. Aries, Cancer, Libra, and Capricorn are Cardinal; Taurus, Leo, Scorpio, and Aquarius are Fixed; and Gemini, Virgo, Sagittarius, and Pisces are Mutable.