Clover is a symbol of life, luck and abundance. Actually, toadstone is a fossilized shark's tooth. It is believed to heal illnesses and to repel evil. Salt is considered to be a hallowing substance that purifies, repels evil, and attracts wealth. In Roman times, salt was considered a substitute for money.
Salt is used to banish evil.
Catholic baptism employs it for purification. Some believe that it will repel demons. According to legend, silver is a holy metal which can injure evil. Only a silver object can harm a werewolf. In late medieval times, a silver bullet was used to dispatch a condemned felon who was believed to be in league with the devil.