tal·is·man  noun \ˈta-ləs-mən, -ləz-\

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: an object (such as a ring or stone) that is believed to have magic powers and to cause good things to happen to the person who has it.  :  an object held to act as a charm to avert evil and bring good fortune  :  something producing apparently magical or miraculous effects  (Merriam Webster Dictionary)