Jann are shape-shifters who lives in the desert, and take the forms of whirlwinds and white camels. They are open-minded about humans, and were among the first jinn encountered by people. They have the power to hide or reveal oases in the desert, depending on whether they like or dislike a party of travelers. They are the enemies of the ghul.
Jann was the father of the jinn, in some accounts.