Shemhamphorash
In the Talmud, the external term representing the hidden word of power, by whose virtues it were possible to create a new world. But it is lost to man, though even sounds approximating to it have a magic power, and can give to him who pronounces them dominion in the spirit-world. Some of the Rabbis say that the word of power contains twelve letters, others, forty-two, and yet others seventy-two; but these are the letters of the divine alphabet, which God created from certain luminous points made by the concentration of the primal universal Light. Shemhamphorash is, in fact, the name of this word.