We have a term over here in New Zealand, (and this is used in a few Non-US countries)
it is called Square Millimetres and gives the Cross-sectional Area of a particular wire or cable, based on the size of the individual wires and the number of such wires.
Here, the wires number 1,3,7,19, in numbers of strands, as the cables get bigger.
That doesn't include CEMPEX flexible Mains conductors that we use inside switch panel enclosures, that may have up to 2000 fine wires, but has the same size as a 1/0 conductor.
Different strokes for different folks, you know!.