The American Wire Gauge (AWG) is an American standard that does not belong to international standards, in which the cross section of a metal wire is indicated by a limited number of numerical codes. The AWG code is used in some American-oriented countries, in particular in electrical engineering to indicate the thickness of electrical conductors and their accessories, such as ferrules, cable lugs and terminals, and, for example, in body piercing technique to indicate the thickness of the piercings to indicate. The AWG value increases as the wire is thinner and can be converted to metric values by tables or formulas.