Mb

mb, Mb, and MB may stand for:

Manitoba
Mercedes Benz
a manned base
Bachelor of Medicine (academic degree)
Medical Board
megabit (Mb)�, or 1,048,576 (2²⁰) bits, or 1,000,000 bits
megabyte (MB)�, or 1,048,576 (2²⁰) bytes, or 1,000,000 bytes
millibar (mb)�, a unit of pressure equal to one hectopascal

� 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.