MegaSI prefix in the SI system of units denoting a factor of 106, i.e. one million; 1 000 000.
For example, 1 MW (megawatt) = 1 000 000 watts = 1 000 kilowatts.
Other common examples of usage:
- one megaton (a unit often used in measuring the explosive power of nuclear weapons) is 1,000,000 tons.
- Megahertz - frequency of electromagnetic radiation for radio and televion broadcasting, GSM, etc. 1 MHz = 1 000 000 Hz
The prefix mebi has been suggested as an alternative for 220 to avoid ambiguity, but is yet to be widely used.