Final answer:
In J.M. Barrie's play "Peter Pan," Wendy gives Peter a thimble to represent a kiss, and Peter gives Wendy an acorn button in return. Wendy keeps her "kiss" by wearing the thimble on a chain around her neck.
Step-by-step explanation:
In J.M. Barrie's play "Peter Pan," when Peter doesn't know what a kiss is, Wendy gives him a thimble to represent a kiss. In return, Peter gives her an acorn button. Wendy keeps her "kiss" by placing the thimble on a chain and wearing it around her neck.