what is the sign for foot?
The international standard symbol for a foot is ft (see ISO 31-1, Annex A). In some cases, the foot is denoted by a prime, which is often marked by an apostrophe, and the inch by a double prime; for example, 2 feet 4 inches is sometimes denoted as 2â²â4â³, 2â² 4â³ or 2â²4â³.