Main Page | See live article | Alphabetical index mb, Mb, and MB may stand for: Manitoba Mercedes Benz a manned base Bachelor of Medicine (academic degree) Medical Board megabit (Mb)¹, or 1,048,576 (220) bits, or 1,000,000 bits megabyte (MB)¹, or 1,048,576 (220) bytes, or 1,000,000 bytes millibar (mb)¹, a unit of pressure equal to one hectopascal ¹ Although this is correct usage, capitalisation is often incorrect or completely ignored in many documents, so that the context is more of a clue to what each means. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.