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.
All nations, including the U.S., are unified under one version of metric: the International System of Units, or SI. Currently, the U.S. is using both SI and inch-pound standards. Most countries have converted from the inch-pound system and now use SI as the standard measurement system. In these nations, the use of inch-pound products is limited to maintenance parts for older machinery and equipment.