Collectible coins, specifically the "So-Called Dollars," are a type of numismatic item produced primarily for commemorative purposes rather than currency circulation. The term relates to medals that resemble dollar coins and were often created for events or expositions. In the United States, the Hibler-Kappen catalog identifies various issues, including the 1892 So-Called Dollar, which commemorated significant national events or anniversaries. These coins are often sought after by collectors for their historical significance and artistic design.