Collectible coins encompass various categories, including numismatic coins, bullion coins, and exonumia. The United States has a rich history of collectible coins, with the One Dollar coin being a prominent example. These coins may feature significant historical figures or events and are sought after for their numismatic value and potential investment appeal. Exonumia refers to related items, such as tokens, medals, and other coin-like objects that are not official currency but hold collectible value. Collectors often focus on factors like rarity, condition, and historical significance when evaluating these items.