What is a lucky dime?

Could you please elaborate on the concept of a "lucky dime"? Is it a belief or superstition associated with a specific type of dime, or perhaps a cultural or historical reference? Are there any particular characteristics or markings that distinguish a lucky dime from a regular dime? Are there any rituals or traditions surrounding the handling or carrying of a lucky dime? Understanding the context and origins of this term would help me to better grasp its significance.