1. MBCS: Multi Byte Character Set.
  2. MBR: Master Boot Record.
  3. MDI: Multiple Document Interface.
  4. MICR: Magnetic Ink Character Recognition.
  5. MAN: Metropolitan Area Network.
  6. MANET: Mobile Ad-Hoc Network.
  7. Mb: Megabit.
  8. MB: Megabyte.
  9. MIDI: Musical Instrument Digital Interface.
  10. MMU: Memory Management Unit.
  11. MMX: Multi-Media Extensions.
  12. MNG: Multiple-image Network Graphics.
  13. MOSFET: Metal-Oxide Semiconductor Field Effect Transistor.
  14. MIMO: Multiple-Input Multiple Output.
  15. MIPS: Million Instructions Per Second.
  16. MIME: Multipurpose Internet Mail Extensions.
  17. MHz: Megahertz.
  18. MPEG: Motion Pictures (coding) Experts Group.
  19. MVS: Multiple Vendor System.
  20. MPL: Mozilla Public License.
  21. MSB: Most Significant Bit.
  22. MS-DOS: Microsoft Disk Operating System.