Describe symbolism in Practical Demonkeeping: A Comedy of Horrors by Christopher Moore

The candlesticks made from the Seal of Solomon represent three incantations. One of them calls the demon Catch the destroyer and puts him under the caller's control. The second incantation sends Catch back to hell. The third incantation calls Gian Hen Gian, King of the Djinn, and puts him under the caller's control.