Similar units of measurement existed in many areas of what is now modern Europe, with the word for inch in Portuguese, French, Italian, Spanish and numerous other languages being the same or very similar to the word for thumb. In the 12th Century the Scottish inch was defined as being equivalent to the width of an average man's thumb at the base of the nail. The inch has been used as a unit of measurement in the United Kingdom since at least the seventh century, and in 1066 was defined as being equal to the length of three dried barleycorns placed end-to-end (a definition which survived for several centuries). Because the values were so close, and because Britain has already settled on that value, the ASA adopted this value on March 13, 1933. In March 1932 the American Standards Association were asked to rule on whether to adopt the same value (at the time the American inch was 1/.03937 mm which approximated to 25.400051 mm). The British Standards Institute defined the inch as 25.4mm in 1930 in the document "Metric Units in Engineering: Going SI". This was not a satisfactory reference as barleycorn lengths vary naturally. The first explicit definition we could find of its length was after 1066 when it was defined as the length of three barleycorns. Use of the inch can be traced back as far as the 7th century. customary measurement systems, representing 1/12 of a foot and 1/36 of a yard. The inch is a unit of length used primarily in the imperial and U.S. Japanese manufacturers such as Sony and Toshiba commonly use inches to describe the size of monitors. The inch is still a common unit in the US, and is popular in Canada and the UK. The inch is both an imperial unit and part of the US system of customary units and as such the inch has widely been used in the past.
(For example, six inches can be symbolised as either 6in or 6").
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