The Eye of Horus is an ancient Egyptian symbol of protection, royal power and good health. The eye is personified in the goddess Wadjet (also written as Wedjat, Uadjet, Wedjoyet, Edjo or Uto and as The Eye of Ra) or "Udjat" The name Wadjet is derived from "wadj" meaning "green" hence "the green one" and was known to the Greeks and Romans as "uraeus" from the Egyptian "iaret" meaning "risen one" from the image of a cobra rising up in protection.
In the Ancient Egyptian measurement system, the Eye Of Horus defined Old Kingdom number one (1) = 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64, by throwing away 1/64 for any rational number. Eye of Horus numbers created six-term rounded-off numbers.
