A fictional currency is some form of system of money defined, depicted, or alluded to, in works of fiction, such as novels, films or video games. The names of units of such currency are sometimes based on extant or historic currencies (e.g. "Altairian dollars" or "Earth yen") while other names, such as "Kalganids" in Asimov's Foundation series, may be wholly invented. A particularly common type, especially in science fiction, is electronically managed "credits". In some works of fiction, ex Autho...