The Tetragrammaton is an ancient amulet, which was very popular during the Middle Ages; it can still be found nowadays in one of Westminster Abbey's windows. There are many variations of this symbol. The most usual one has four Hebrew letters inscribed in a circle with a pentagram (five-pointed star). The Hebrew letters literally translate to YAHWEH (God, in Hebrew). The amulet is a physical and spiritual protector of health and safety.The Tetragrammaton is an amulet with great protection powers. It is the protector of health and safety in a physical and spiritual sense. Due to its great protection powers, it is also used as a shield against the power of black magic.