1. The zodiacal signs are divided into four groups called "triplicities," and in their order they represent the four elements, fire, earth, air and water.
Fiery Triplicity is composed of Aries, Leo, and Sagittarius
Earthly Triplicity: Taurus, Virgo, and Capricorn
Airy Triplicity: Gemini, Libra, and Aquarius
Watery Triplicity: Cancer, Scorpio, and Pisces