Southpaw is a boxing term that designates the stance where the boxer has his right hand and right foot forward, leading with right jabs, and following with a left cross right hook. Southpaw is the normal stance for a left-handed boxer.
Because the American system of measurement is very similar to the British imperial system, units are also commonly referred to as imperial units. The units have many different origins.
The U.S. Customary System of measurement derives from the British Imperial System of measurement. The British Imperial System has been superseded by the metric system and is no longer used in an official capacity. According to the CIA World Factbook, the United States, Burma and Liberia are the only nations that have not adopted the metric system as the official system of measurement.