It was known as the most sacred Cross of Egypt, the Ankh that was carried in the hands of the gods, and the Pharaohs. The sign of life, the living, an oath, and a covenant which denotes the birthplace in the northern quarter of the heavens from which the sun is reborn. A T-square is an Ancient Egyptian hieroglyph for “Tau” which means “sacred gate” or “sacred opening”.
Albert Mackey had written; “A symbol used in the Degrees of Knights Templar and Knight of the Brazen Serpent. The cross is a tau cross T, and the serpent is twined around. Its origin is found in Numbers xxi, 9, where it is said, “Moses made a serpent of brass, and put it upon a pole.” The Hebrew word Nes, here translated a pole, literally means a standard, or something elevated on high as a signal, and may be represented by a cross as well as by a pole. Indeed, Justin Martvr calls it a cross.”
TAU cross. St. Jerome had said that the letter Tau was ordered to be placed on the foreheads of those mourners, and that the Hebrew letter Tau, was formerly written like a cross in which the people were to be signed with the sign of the cross. The Seraphic Saint Francis had chosen not to use the traditional Christian cross we see today, but instead wore the true Tau cross as his cross of salvation. He even painted in on the walls and doors of the places where he stayed just like the ancient Israelites had done. Today is still used as a symbol of the Franciscan Order.
the heavens on the As Above that rules over man via the chemical energies in his brain, sexual organs and desire. Through Jupiter we find the Alpha and Omega of all life and nature through its chemical energies that it emits on the So Below known in science as the Greek Phosphorus, and in Latin Lucifer. The essential ingredient in the creation of all life and the immortal energy in which it does not die like Jesus who was crucified on the cross, but later had risen from the dead.
The Tau signifies the final path to enlightenment or illumination, in which the true cross is our final redemption to the Christ-man. Hence “I-T is finished.”This Tau was in the form of the cross of this degree, and it was the emblem of life and salvation. The Samaritan Tau and the Ethiopic Tavvi are the evident prototype of the Greek r; and we learn from Tertullian, Origen, and St. Jerome, that the Hebrew Tau was anciently written in the form of a Cross.In ancient times, the mark Tau was set on those who had been acquitted by their judges, as a symbol of innocence. The military commanders placed it on soldiers who escaped unhurt from the field of battle, as a sign of their safety under the Divine Protection.It was a sacred symbol among the Druids. Divesting a tree of part of its branches, they left it in the shape of a Tau Cross, preserved it carefully, and consecrated it with solemn ceremonies. On the tree they cut deeply the word Thau, by which they meant God. On the right arm of the Cross, they inscribed the word Hesuls, on the left Belen or Belenus, and on the middle of the trunk Tharamis. This represented the sacred Triad.
The TAU cross was inscribed on the forehead of every person admitted into the Mysteries of Mithras. When a king was initiated into the Egyptian Mysteries, the TAU was placed against his lips. It was tattooed upon the bodies of the candidates in some of the American Indian Mysteries. To the Qabbalist, the TAU stood for heaven and the Pythagorean tetractys. The Caduceus of Hermes was an outgrowth of the TAU cross. (See Albert Pike.)
Source:
http://gnosticwarrior.com/the-true-cross.html


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