The image of an eye in a triangle, often with the indication or expanding rays of light or a “glory” around it. Its original source was the Egyptian image of the Eye of Horus. In Medieval times, the surrounding triangle was added, with Christians saying this represented the Trinity. Mystically, it has become associated with Freemasonry as early as 1797, symbolic of the Great Architect of the Universe who is believed to observe the thoughts and deeds of the Mason. Fifteen years earlier, it was adopted as part of the symbolism on the reverse of the Great Seal of the United States. This implies that a Masonic influence on the Seal was unlikely.