A very ancient symbol which is believed by some to be a relic of primitive sun-worship. In most of the ancient languages of Asia, the eye and the sun are expressed by the same word. The centre of the eye can be seen as a point within a circle, expressing the philosophical idea of the Union of the two great Causes of Nature, which concur, one actively and the other passively, in the generation of all beings.
The Primordial All-Seeing Eye either alone or within a triangle has been used extensively by many secret societies including occultists and freemasons. A symbol of the higher clairvoyance, and used often as a representation of the third or spiritual eye. The esoteric tradition relates the single eye to the inner light, intuitive power, illumination, and even the philosopher's stone!
The eye within a pyramid originally represented the god enclosed, during his "dead" period, awaiting rebirth. He was entombed in the underworld, thus becoming Seker, the Hidden One, Lord of Death.