1/one billion
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It is not normal to say giga-kilo (this would actually be tera). Anyway giga means 109 or a billion
Giga is a prefix which means one billion. For example: 1 Gigapascal = 1 billion Pascals.
Giga prefix is 10 to the 9th power, so it is 1,000,000,000 (or 1 billion)
a number
Giga- It is worth noting that when used in computer terminology, this prefix is something of an anachronism. The computer prefix "Giga" refers to 2^30, which is 1,073,741,824 and not 1,000,000,000 as Giga means in the metric system.