it doesn't have a specific name. It is just written as 1/3 mm. It can also be written as o.333333333333333333333333mm but this is long, annyoing to write out and actually less accurate than 1/3
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A third of a millimeter (0.33 mm) is quite small—about the thickness of a fine human hair, which typically ranges from 0.1 to 0.2 mm. To visualize it, consider that a standard pencil lead is around 0.5 mm in diameter; thus, a third of a millimeter would be noticeably thinner than that. In practical terms, it’s difficult to see without magnification, as it's much smaller than most common objects.
Metre.
decimeter
flys are a millimeter long
a millimeter is the length of a millimeter