what is giga
Look up giga-in Wiktionary, the free dictionary. Giga (/ËdÊÉªÉ¡É/ or /ËÉ¡ÉªÉ¡É/) is a unit prefix in the metric system denoting a factor of a (short-form) billion (10 9 or 1000000000). It has the symbol G. Giga is derived from the Greek word Î³Î¯Î³Î±Ï, 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 10 9 Ã.