The ninth letter of the Hebrew alphabet, it symbolizes the snake or serpent (nahash) in the Garden of Eden (Sex). Its Kabbalistic value is 9.
"In these studies of Kabbalah, we need to be practical; there are authors who write marvels, but when one looks at them, one realizes that they have not lived what they have written; they did not experience it in themselves, and that is why they are mistaken. I understand that one must write what one has directly experienced by oneself. I have proceeded in this way for my part."