Water. Earth. Fire. Air. This isn’t just an opening phrase to a fantasy book or movie. It is also a very important foundation to modern astrology. Zodiac element meanings vary, and they influence each sign – and person – greatly. You may know there are 12 signs of the zodiac, but do you know the element of each sign? There are four elements: fire, earth, air, and water, or three signs per each element – this is called a triplicity by modern astrologers.