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MB, MB or M. B. may refer to:

Businesses and organizations[edit]


  • Megabyte (MB), a measure of amount of information used, for example, to quantify computer memory or storage capacity
  • Megabit (Mb, or properly: Mbit), a measure of amount of information
  • MikroBitti (formerly MB), a Finnish computer magazine


  • Millibar, a unit of pressure frequently used in meteorology equal to one thousandth of a bar
  • Millions of barrels (Mb, Mbbl or MMbbl), one million barrels of oil
  • Megabase, a unit of measurement in genetics
  • Body wave magnitude (mb), a type of seismic scale
  • Millibarn, a unit of area used in nuclear physics and particle physics
  • mb, a rarely used unit of Imperial weight equal to 1000 lbs or roughly 453 kilograms
  • Millibel, a hundredth of a decibel

Other uses[edit]