A pin head.
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A period is 1.
1 millimeter is 1 millimeter. But, as 10 millimeters = 1 decimeter then we can state 1 millimeter = 0.1 decimeter.
There are 1,000 micrometers in one millimeter.
1 millimeter=1,000 microns
1 millimeter = 0.0393700787 inches