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  2. Circular mil - Wikipedia

    en.wikipedia.org/wiki/Circular_mil

    1000 circular mils = 1 MCM or 1 kcmil, and is (approximately) equal to: ... (This is the same result as the AWG circular mil formula shown below for n = −3)

  3. Milliradian - Wikipedia

    en.wikipedia.org/wiki/Milliradian

    A milliradian (SI-symbol mrad, sometimes also abbreviated mil) is an SI derived unit for angular measurement which is defined as a thousandth of a radian (0.001 radian). ). Milliradians are used in adjustment of firearm sights by adjusting the angle of the sight compared to the barrel (up, down, left, or

  4. American wire gauge - Wikipedia

    en.wikipedia.org/wiki/American_wire_gauge

    The next wire size thicker than 4/0 has a cross section of 250 kcmil. A circular mil is the area of a wire one mil in diameter. One million circular mils is the area of a circle with 1,000 mil (1 inch) diameter. An older abbreviation for one thousand circular mils is MCM.

  5. Circular measure - Wikipedia

    en.wikipedia.org/wiki/Circular_measure

    A circular measure was used in comparing circular cross-sections, e.g., of wires, etc. A circular unit of the ares is the area of the circle whose diameter is one linear unit. [1] For example, 1 circular mil is equivalent to 0.7854 square mil in area, 1 circular millimeter

  6. Wire gauge - Wikipedia

    en.wikipedia.org/wiki/Wire_gauge

    Following one of its recommendations, it differs from pre-existing gauges scarcely more than they differ among themselves, and is based on a rational system, the basis being the circular mil. No. 7/0, the largest size, is 0.50 inches (500 mils or 12.7 mm) in diameter (250 000 circular mils in cross-sectional area), and the smallest, No. 50, is ...

  7. Circular error probable - Wikipedia

    en.wikipedia.org/wiki/Circular_error_probable

    The original concept of CEP was based on a circular bivariate normal distribution (CBN) with CEP as a parameter of the CBN just as μ and σ are parameters of the normal distribution. Munitions with this distribution behavior tend to cluster around the mean impact point, with most reasonably close, progressively fewer and fewer further away ...

  8. Square mil - Wikipedia

    en.wikipedia.org/wiki/Square_mil

    1 square mil is equal to: 1 millionth of a square inch (1 square inch is equal to 1 million square mils) 6.4516 × 10 −10 square metres; about 1.273 circular mils (1 circular mil is equal to about 0.7854 square mils). 1.273 ≈ ⁠ 4 / π ⁠ and 0.7854 ≈ ⁠ π / 4 ⁠.

  9. Metric prefix - Wikipedia

    en.wikipedia.org/wiki/Metric_prefix

    Since the mid-1990s, kcmil has been adopted as the official designation of a thousand circular mils, but the designation MCM still remains in wide use. A similar system is used in natural gas sales in the United States: m (or M ) for thousands and mm (or MM ) for millions (thousand thousands) of British thermal units or therms , and in the oil ...