1. 
   Circular mil
   Therefore, the following conversions apply: 1 circular mil is approximately equal to: 1000 circular mils = 1 MCM or 1 kcmil, and is (approximately) equal to: Therefore, for practical purposes such as wire choice, 2 kcmil ≈ 1 mm² is a reasonable rule of thumb for many applications. ==AWG circular...
   Found op http://en.wikipedia.org/wiki/Circular_mil
   
   
2. 
   Circular-Mil
   (cmil) The area of a circle with a diameter of one mil (1/1000 inch), used to describe the cross-sectional area of a conductor. One cmil equals approximately 0.0000008 square inches.
   Found op http://www.youngco.com/young2.asp?ID=4&Type=3
   
   

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