It is a symbol that is used for guidance and protection, while also symbolizing the basic elements corresponding to the cardinal directions, along with space/spirit, space/soul, creation, and destruction. It can at the same time represent endless direction, personal sovereignty, and the inner alchemical processes. The Tria Prima [Greek for Three Primes] symbolizes protection in all of those aspects of existence; antimony (the astrological symbol of The Earth) representing the animalistic parts of human nature. The inverted antimony symbol is an indication of polar opposites in energy, and in Nature (also the astrological symbol for Venus). Antimony is an element in which serves a vital purpose in physical existence, which is why it is considered a prime, along with the other three. The incriptions, describe Light, and Dark.