Q: What number does "giga" stand for?
A: One billion.
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The prefix giga- usually refers to a multiplying factor of one billion; a gigahertz is one billion cycles per second.
The exact value of giga, in the context of metric prefices is 10^9 = 1,000,000,000 (1 billion). In the context of computer technology, it is 2^30 = 1,073,741,824.
10 is a 2 bit binary number, when converted to decimal numbers it is 2.
In computers, giga is 1024 (2^10) times bigger than mega. In normal metric usage, giga is 1000 (10^3) times bigger than mega. This is due to the fact that computers use binary internally
Giga means billion. 5 gigas equals 5 billion.