JINN (DIINN)  , the name of a class of spirits (genii) in Arabian mythology . They are the offspring of fire, but in their form and the propagation of their kind they resemble human beings . They are ruled by a race of kings named " Suleyman," one of whom is considered to have built the pyramids . Their central home is the mountain Kai, and they manifest themselves to men under both animal and mortal form and become invisible at will . There are good and evil jinn, and these in, each case reach the extremes of beauty and ugliness .