Abrahadabra is a word that appears in The Book of the Law, and is described by Aleister Crowley as the "Word of the Aeon" and that it “represents the Great Work complete, and it is therefore an archetype of all lesser magical operations” (Crowley, 1997). It is not to be confused with the Word of the Law of the Aeon, which is Thelema.
Abrahadabra is also referred to as the Word of Double Power. More specifically, it represents the uniting of the Microcosm with the Macrocosm—represented by the pentagram and the hexagram, the rose and the cross, the circle and the square, the 5 and the 6, etc.—also called the attainment of the Knowledge and Conversation of one's Holy Guardian Angel. In Commentaries (1996), Crowley says that the word is a symbol of the “establishment of the pillar or phallus of the Macrocosm...in the void of the Microcosm.” The sexual analogy here is obvious.