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Title: Giga-  
Author: World Heritage Encyclopedia
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Subject: Binary prefix, Metric prefix, GeForce 9 series, SI prefixes, ISOHDFS 27
Publisher: World Heritage Encyclopedia


Giga ( or ) is a unit prefix in the metric system denoting a factor of a (short-form) billion (109 or 1000000000). It has the symbol G.

Giga is derived from the Greek word γίγας, meaning "giant". The Oxford English Dictionary reports the earliest written use of giga in this sense to be in the Reports of the IUPAC 14th Conference in 1947: "The following prefixes to abbreviations for the names of units should be used: G giga 109×".

When referring to information units in [1][2] The inconsistency is that gigabit is never (or very rarely) used with the binary interpretation of the prefix, while gigabyte is sometimes used this way. The binary prefix gibi has been adopted for 230, while reserving giga exclusively for the metric definition.


In English, the initial g of giga can be pronounced /ɡ/ (a hard g as in == Taxonavigation == Genus: Alpopsyche


  • Waringer, J. et al. 2011: The larva of Alpopsyche ucenorum (McLachlan 1876) (Trichoptera: Limnephilidae) with notes on its systematic position and ecology. Zootaxa, 2967: 44–50. Previewgiggle), or ( (a soft g as in giant, like a j sound, which shares its Greek root).[3]

This latter pronunciation was formalized within the United States in the 1960s and 1980s with the issue by the US National Bureau of Standards of pronunciation guides for the metric prefixes.[4] A prominent example is found in the pronunciation of gigawatts in the 1985 movie Back to the Future.

According to the American writer Kevin Self, a German committee member of the [ɡ] was originally inten

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