A person who collects coins, banknotes or medals can be called a "numismatist" or, less commonly, a "numismatologist." The word is more accurately used to refer to people who formally study currency, whether or not they actually collect it.
The nouns "numismatist," denoting the collector, and "numismatics," denoting the academic study of currency itself, derive from the Latin noun "numisma," meaning "coin." Though these terms first appeared in the English language during the 19th century, according to the London Mint Office, the history of coin collecting can be traced back to the foundation of the Roman Empire. Many celebrities have admitted to being coin collectors, including Wayne Gretzky, Joan Crawford and James Earl Jones.