» Inches redirects here. To see the Les Savy Fav album, see Inches. For the measure of Precipitation in inches, see rain gauge. An inch (plural: inches; symbol or abbreviation: in or, sometimes, ″ - a double prime) is the name of a unit of length in a number of different systems, including English units, Imperial units, and United States customary units. Its size can vary from system to system. There are 36 inches in a yard and 12 inches in a foot. A corresponding unit of area is the squ… (More on Inch)