Patterns are specially produced coins that serve as prototypes or experimental designs, often created to gauge public reaction or to evaluate new minting techniques. In the United States, patterns are highly collectible due to their rarity and historical significance. The 1854 pattern coins, for example, were part of efforts to modernize the U.S. coinage system, featuring unique designs that differ from regular issue coins. These items are typically struck in limited quantities and can command high prices in the numismatic market.