So-Called Dollars are a type of collectible medal or coin that commemorate specific events, individuals, or institutions, particularly from the United States. They were primarily produced in the late 19th century and gained popularity during events such as Expositions and Fair trade shows. The term "So-Called Dollars" originates from the book "So-Called Dollars" by Harold E. Robinson, which catalogs these pieces, including examples from 1885. While they are not official currency, many collectors admire them for their historical significance and artistic designs.