The Thai "baht" originated from a traditional unit of mass. Its currency value was originally expressed as that of silver of corresponding weight (now defined as 15 grams), and was in use probably as early as the Sukhothai period in the form of bullet coins known in Thai as phot duang (Thai: พดด้วง). These were pieces of solid silver cast to various weights corresponding to a traditional system of units related by simple fractions and multiples, one of which is the baht.
The riel (Khmer: រៀល; sign: ៛; code: KHR) is the currency of Cambodia. There have been two distinct riel, the first issued between 1953 and May 1975. Between 1975 and 1980, the country had no monetary system. A second currency, also named "riel", has been issued since March 20, 1980. However, this currency has never gained much public acceptance, with most Cambodians preferring foreign currency. The UN peacekeeping operation of 1993 injected a large quantity of U.S. dollars into the local economy. As a result, the dollar has become the country's common currency.[1] Riel notes are used for fractional dollar amounts as U.S. coins are not in circulation.
