fob

n. /fɑːb/ C2

表链坠饰；钥匙扣

A small decorative object attached to a watch chain or key ring.

仙境例句

A little fob shaped like a teapot hung from the March Hare's door key.

三月兔的门钥匙上挂着一个茶壶形状的小挂件。