In the context of collectible coins, patterns refer to experimental pieces that are struck to test new designs or compositions. The 1814 Fifty Cents or half dollar pattern coins from the United States of America are notable examples. These trial coins were created during a period of experimentation in American numismatics, showcasing various artistic approaches and potentially serving as prototypes for final designs. Collectors often seek such patterns for their historical significance and rarity, making them valuable additions to numismatic collections.