The devil has symbols of his power.
Christians should never have symbols of the devil's power in their possession. They are of the devil's power and may have strength that we don't know about.
The heathen use all kinds of symbols to worship. The witch doctors of the world make dolls and put pins through them to cause injury to their enemies from a distance. Dolls are used in evil practices.
All voodoo religions have artifacts; good luck charms, and all kinds of symbols referring to the power of satan.