A nanometre.
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A micron is one millionth of a meter and therefore one thousandth of a millimeter.
There are one million millimeters in a kilometer, so a millimeter would represent one millionth of a kilometer.
A micrometer is one millionth of a meter, a millimeter is one thousandth of a meter. So there are one thousand micrometers in a millimeter.
A 'micrometer' is a unit of length equal to one thousandth (10 -3) of a millimeter or one millionth (10 -6) of a meter. [For your information, - A 'nanometer' is a unit of length equal one thousandth (10 -3) of a micrometer, one millionth (10 -6) of a millimeter or to one billionth (10−9) of a meter].
1 nanometer = 1/1,000,000 mm which is one one-millionth of a millimeter or one one-billionth of a meter.