Under the IEC 60027-2 A.2 and ISO/IEC 80000 standards, the correct notation of 2 30 is gibi (symbol Gi). ^ The fermi was introduced earlier with the symbol "fm", which prompted the reinterpretation of the "f" as a prefix to "m", with femto being derived from the Danish word femten.A lower case u is often used instead of μ where the latter character is unavailable. ^ The abbreviation mcg is often used in medicine instead of μg to prevent confusion with mg, which can lead to overdoses.^ a b c d e f Part of the beginning of the prefix was modified from the word it was derived from, e.g.: "peta" (prefix) vs "penta" (source word).The introduction of the CGS system was in 1873. ^ Prefixes adopted before 1960 already existed before SI.gigayear or gigaannum-one billion (10 9) years, sometimes abbreviated Gyr, but the preferred usage is Ga.gigabyte-for instance, for hard disk capacity, 120 GB = 120 000 000 000 bytes.gigabit- bandwidth of a network link, for instance, 1 Gbit/s = 1 000 000 000 bit/s.gigahertz- clock rate of a CPU, for instance, 3 GHz = 3 000 000 000 Hz.Wells found that 84% of Britons preferred the pronunciation of gigabyte starting with /ɡɪ/ (as in gig), 9% with /dʒɪ/ (as in jig), 6% with /ɡaɪ/ ( guy), and 1% with /dʒaɪ/ (as in giant). In 1998, a poll by the phonetician John C. Self was unable to ascertain when the /dʒ/ (soft g) pronunciation came into occasional use, but claimed that as of 1995 it had returned to /ɡ/ (hard g). This suggests that a hard German was originally intended as the pronunciation. Ī prominent example of this latter pronunciation is found in the pronunciation of gigawatts in the 1985 film Back to the Future.Īccording to the American writer Kevin Self, a German committee member of the International Electrotechnical Commission proposed giga as a prefix for 10 9 in the 1920s, drawing on a verse (evidently "Anto-logie") by the German humorous poet Christian Morgenstern that appeared in the third (1908) edition of his Galgenlieder (Gallows Songs). In English, the prefix giga can be pronounced / ˈ ɡ ɪ ɡ ə/ (a hard g as in giggle), or / ˈ dʒ ɪ ɡ ə/ (a soft g as in gigantic, which shares giga 's Ancient Greek root).
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