kilo
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micro
The SI prefix meaning of 0.001 is "milli-". This prefix denotes a factor of 1/1000, so 0.001 can be written as 1 milliunit.
The metric prefix meaning one million is mega-, as in megabyte.The metric prefix meaning one-millionth is micro-, as in micrometer.
In the metric system, the prefix for 1 billion is "giga-".
centi-