Apotrope
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Apotrope (adj.: apotropaic) refers to objects such as amulets and talismans or other symbols intended to "ward off evil" or "avert or combat evil."
The word is of Greek origin and literally means "turning away" which was seen in the apotropaic eye, an exaggerated eye painted on drinking vessels in the 6th century BC to ward away spirits while drinking. Curiously, eyes were often painted to ward off the evil eye. The word is also used in vampire fiction in reference to symbols such as crucifixes, the Holy Sacraments, silver bullets, wild roses and garlic that can ward away or destroy vampires.
Because of the shared meaning, an "apotropaic amulet" would be redundant, rather an apotropaic symbol can be an amulet.