Sometimes you need a very large, or a very small, amount of a certain unit. One way to deal with that is to use prefixes like kilo, mega, milli, micro, and others.
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International System of Units (SI)
You can use any of the standard SI prefixes with the standard unit of length, the meter. However, it's more common to use non-SI units: astronomical units, light-years, and parsecs for large distances, especially in astronomy. The largest of these is the parsec; but you can also use metric prefixes with that, e.g., kiloparsec, or megaparsec.
si units are based on the metric system system international (French) international system (English)
A miligram. Grams are an SI unit, so they go with all the standard SI prefixes.
SI is a base 10 standardized system