and Canada have partially metricated their units of measurement. The foot is recognized as an alternative expression of length in Canada officially defined as a unit derived from the meter although both the U.K. The foot is legally recognized in the United Kingdom road signs must use imperial units (however, distances on road signs are always marked in miles or yards, not feet), while its usage is widespread among the British public as a measurement of height. The United States is the only industrialized nation that uses the international foot and the survey foot (a customary unit of length) in preference to the meter in its commercial, engineering, and standards activities. Its length was usually between 250 mm and 335 mm and was generally, but not always, subdivided into 12 inches or 16 digits. It varied in length from country to country, from city to city, and sometimes from trade to trade. Historically the "foot" was a part of many local systems of units, including the Greek, Roman, Chinese, French, and English systems. In both customary and imperial units, one foot comprises 12 inches and one yard comprises three feet. Since the International Yard and Pound Agreement of 1959, one foot is defined as 0.3048 meters exactly. The prime symbol, ′, is a customarily used alternative symbol. feet), standard symbol: ft, is a unit of length in the British imperial and United States customary systems of measurement. For other uses, see Foot (disambiguation). For sizing of the human foot, see Shoe size. This article is about the unit of measure.
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