Metric Prefix

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A prefix appended to a unit to indicate some multiple of that unit, usually multiples of 1,000. For example:

Kilo- (K)10³thousand

Mega- (M)10⁶million

Giga- (G)10⁹billion

Tera- (T)10¹²trillion

Peta- (P)10¹⁵quadrillion

Exa- (E)10¹⁸quintillion

In computing, metric prefixes are used to indicate multiple quantities of bits and bytes. For example, one kilobit is equal to approximately 1,000 bits. (Actually, since computing is based on a binary system, not a decimal one, "kilo-" is used to refer to 2¹⁰, which equals 1,024, the closest number to 1,000). See Kilo-, Mega-, Giga-, Tera-, Peta-, and Exa-.