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A circular mil is a unit of area, equal to the area of a circle with a diameter of one mil (one thousandth of an inch). It corresponds to 5.067×10−4 mm². It is a unit intended for referring to the area of a wire with a circular cross section. As the area in circular mils can be calculated without reference to π, the unit makes conversion between cross section and diameter of a wire considerably easier.
Square exametre or Square exameter is a SI prefixes applied unit of area, symbol Em2, is a multiple of the of SI prefixes (exa) used with the metre.