The abbreviations for the units of measurement you mentioned are as follows:
- Milliliter: mL
- Megameter: Mm
- Centigram: cg
Each of these abbreviations is derived from the metric system, which is used globally for scientific and everyday measurements. A milliliter is a unit of volume equal to one-thousandth of a liter, suitable for measuring liquids. A megameter is a unit of length equal to one million meters, often used in geographical contexts. Lastly, a centigram is a unit of mass equal to one-hundredth of a gram and is used in contexts where precise measurements are required, like in chemistry.