A
micrometre (American:
micrometer), symbol
µm is an
SI unit of
length that is defined as one millionth of a
metre (or 1×10
-6m). µ is the Greek letter
mu.
A synonym is micron, an old, non-SI name for the micrometre. The name micron, and its symbol µ, although officially discouraged, are still sometimes used in science and electronics.
For a list of objects on the order of one to a 10 micrometers, see 1 E-6 m.
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