Wiktionary
n. An object kept for good luck.
Wikipedia
A Lucky charm is an item within cultures that is believed to bring luck and may refer to:
"Lucky Charm" is a 1989 single by The Boys. The single was their follow up to their debut single, "Dial My Heart", and hit number one on the Hot Black Singles chart for one week. "Lucky Charm" was the only one of their three number ones not to place on the Hot 100.
Usage examples of "lucky charm".
Her presence had amused him for a couple of days, he'd treated her like a lucky charm, a mascot.
Token of religion, lucky charm, or just a comforting reminder of tasks less uncanny?
She stayed there, in the dark, curled into a ball and trembling violently, clutching the suppressor stone in her fist like a child's lucky charm.
Corran tapped his lucky charm once, then forced himself to concentrate.
Even the enlisted men who had joined since he had been away were aware that he was regarded as a lucky charm.
She held up her lucky charm, a plastic angel with the face of a parking meter.
A lot of the 5th Descott considered their general's Messa to be a lucky charm, or a witch, or both.