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The SI system uses prefixes that go up and down in order of thousandths.

So to start, one metre, one thousandth of a metre is a millimetre; one thousandth of a millimetre ( one millionth of a metre) is a micrometre; one thousandth of a micrometre ( one billionth of a metre) is a nanometre.

The symbol for nanometre is "nm", 'n' nano, 'm' metre, both lowercase.

One thousand metres is a kilometre, one thousand kilometres is a megametre, etc.

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Q: Unit of measure equal to one billionth of a meter?
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