Collectible coins, often referred to as numismatic coins, include a variety of types such as historical issues, mint errors, and commemorative coins. In the context of the United States, coins like the Maryland Lord Baltimore are part of the 50 State Quarters Program, which celebrates each state's history and heritage. The Maryland quarter features an image of the Calvert family's shield, honoring Lord Baltimore, the founder of the Maryland colony. Collectors often seek these coins for their artistic design, historical significance, and potential investment value.