Ob, a Hebrew word («sorcerer») for serpent, is possibly from the root of the African and West Indian word obeah.
It is in magical philosophy one of the three forms of fire, associated with magnetism and electricity on the physical level and with the negative, magnetic form of subtle fire on the etheric level. Some sources link this fire to black magic, necromancy, and death. The other two forms of fire are od and aur.
In the Brotherhood of Luxor and occult (H. B. OF L.) traditions descending from it, Ob was the name given for the «ruling spiritual hierophant» of the sinister Dark Satellite. The term was also associated, via dubious etymology, with Oberon, obsession, Obeah, and various other terms connected to spirits and negative magic. A.G.H.
Greer, John Michael. The New Encyclopedia of the Occult. St. Paul. MN. Llewellyn Worldwide. 2005. p. 337