Wiktionary
n. An enclosed spherical metal ball containing an unattached clapper with only a small slit opening, for higher pitched ringing.
Wikipedia
A jingle bell or sleigh bell is a type of bell which produces a distinctive 'jingle' sound, especially in large numbers. They find use in many areas as a percussion instrument, including the classic sleigh bell sound and morris dancing. They are typically used as a cheaper alternative to small 'classic' bells.
The simplest jingle bells are produced from a single piece of sheet metal bent into a roughly spherical shape to contain a small ball bearing or short piece of metal rod. This method of production results in the classic two- or four-leaved shape. Two halves may also be crimped together, resulting in a ridge around the middle. A glass marble may also be used as the ringer on larger bells.
Usage examples of "jingle bell".
She began pacing back and forth over the rag rug in her jingle bell boots.
Turtle was grumpily yanking at a jingle bell on the corner of a pillow, and I was beginning to feel edgy myself.
Bobby Helms had come on singing 'Jingle Bell Rock', a Sound of the Season, as the deejays said, and he had smiled a little, feeling better.