Crepundia are groups of amulets, often strung onto chains in Classical antiquity. They are similar to charm bracelets and are archaeologically associated with children.
Etymology.
The singular form of the word, "crepundium", derives from the Latin word "crepare" "to rattle or make a noise". The word "crepundia" may be confused with "crepitacula", which refers to a form of rattle. Ancient examples may be made from ceramic, wood, or bronze. 
History and features.
Similar amulet chains were used in the ancient world from at least the 4th Century BC. "Crepundia" are referred to in Act 4 of "Rudens" (dated to c.211 BC) in which the character Palaestra describes the contents of a trinket box owned since childhood: a miniature gold sword inscribed with her father's name; a miniature gold axe inscribed with her mother's name; a silver knife; a little pig; a gold "bulla". "Crepundia" are variable objects, but Martin-Kilcher defined five main sorts of objects that feature in them: noise-producing objects; meaningful shapes; those with ‘exterior qualities’; remarkable objects and curiosities; materials valued for their special properties.
The noise-making components of "crepundia" may have been used to calm distressed infants or children, or used as a toy.
References.
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