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US Customary Unit System

United States customary units are a system of measurements commonly used in the United States. Many U.S. units are virtually identical to their imperial counterparts, but the U.S. customary system developed from English units used in the British Empire before the system of imperial units was standardized in 1824. Several numerical differences from the imperial system are present. The vast majority of U.S. customary units have been defined in terms of the meter and the kilogram since the Mendenhall Order of 1893 (and, in practice, for many years before that date). These definitions were refined in 1959. The United States is the only industrialized nation that does not mainly use the metric system in its commercial and standards activities, although the International System of Units (SI, often referred to as "metric") is commonly used in the U.S. Armed Forces, in fields relating to science, and increasingly in medicine, aviation, and government as well as various sectors of industry. [Wikipedia]

US Customary

http://dbpedia.org/resource/United_States_customary_units

http://en.wikipedia.org/wiki/US_customary_units