| Abbreviation | Definition |
|---|---|
| CM | Centimeter |
| cm | centimetre |
| cm | Centimetres |
| CM | Circular Mils |
| cm. | centimeter |
| cm3 | Centimetre Cubed |
| CM³ | Cubic Centimeter |
| CMA | Circular Mil Area |
| CMF | Circular Mil Foot |
| CML | Central Meridian Longitude |
| CMPY | Cubic Meters Per Year |
| CMS | Centimeters |
| CN | Can |
| CN | Carton |
| CNC/IEC | Canadian National Committee of the International Electrotechnical Commission |
| CNC/IEC | Canadian National Committee of the International Electrotechnical Commission |
| COL | Cartridge Overall Length |
| CP | Candle Power |
| CP | Centipoise |
| CPF | Cycles Per Flop |