Superstitious people may consider a rabbit's foot to be a good luck charm due to centuries-old belief that this specific anatomical item provides some sort of totemic protection against harm. There is evidence that humans as far back as the first century B.C.E. believed that rabbits were associated with good luck. There is also evidence that African folk magic included a belief in positive effects that could be imparted by a rabbit's foot.
The Celtic people seemed to believe that rabbits as a whole were lucky, and not just their feet. Some African-American religious beliefs, specifically those involved with hoodoo, focus on the rabbit's foot in particular as a powerful talisman for a variety of purposes. Most people who still believe in the power of a rabbit's foot will say that the token must be from a rabbit's left foot rather than its right.