American wire gauge (AWG),
Definition of American wire gauge (AWG):
US standard measure of the diameter of electricity conducting wires. Since it denotes the number of progressively narrower dies through which the wire is pulled through to reach a particular thinness, it is a backward working (retrogressive) numbering scheme: the thicker the wire, the lower the number and vice versa. AWG assigns numbers only to aluminum, copper, and other non-iron or non-steel (non-ferrous) wires.
Meaning of American wire gauge (AWG) & American wire gauge (AWG) Definition