Choronzon's number is 9, also the number of Man. But Choronzon is also a "demon" within the Enochian writings of Dr. John Dee, likewise within Crowley’s system where Choronzon is "the Dweller in the Abyss," believed to be the obstacle between the adept and enlightenment. But Choronzon is also the name of the demon that guards the Abyss on the Tree of Life—separating the lower from the higher. It’s that Abyss that we must cross to fulfill our spiritual destiny. That demon is the obstacle between the adept and enlightenment. If met with proper preparation by the magician, his function is to destroy the ego, allowing the magician to cross the Abyss. We all must confront our demon. 

The demon is also our Shadow, the lower self of the subconsciousness with our fears and repressions.