X = The Mark of Illumination

2Ki_21:13 And I will stretch over Jerusalem the line of Samaria, and the plummet of the house of Ahab: and I will wipe Jerusalem as a man wipeth a dish, wiping it, and turning it upside down.

Odin's Cross X

"It is the great symbol of manifested light (9), which is indicated by the Greek letter X (khi), initial of the words [197-1] (Chone), [197-2] (Chrysos), and [197-3] (Chronos), crucible, gold, and time, triple unknown of the Great Work. The cross of St Andrew ([197-4] --- Chiasma), in the shape of an X, is the hieroglyph of luminous and divergent radiations, emanated from a unique fire/center, reduced to its simplest expression. Therefore, it is clearly the graphic of the spark. Its radiation can be multiplied, but it is impossible to further simplify it. These intersecting lines produce the diagram of the shining of stars, of the radiating dispersion of all that shines, lightens and irradiates. Thus it has been made the seal, the mark of illumination, and, in a wider sense, of spiritual revelation.

The Holy Spirit is always perpendicular to its body, that is to say, in a cross. For the Greek cross and that of St Andrew have in hermetics a exactly similar meaning. One frequently encounters the image of the dove completed by a halo which specifies the hidden meaning, as can be seen in the religious scenes of our Primitives and in a number of purely alchemical sculptures (10).

The Greek X and the French X represent the writing of light by light itself, the trail of its passage, the manifestation of its movement, the affirmation of its reality. It is its true signature. Until the 12th century, no other mark was used to authenticate old charters; from the 15th century on, the cross became the signature of illiterates. In Rome, auspicious days were signed with a white cross and unfavorable ones with a black cross.