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'micro-' is a prefix in the SI and other systems of units denoting a factor of 10⁻⁶ (one millionth).^[1]
Confirmed in 1960, the prefix comes from the Greek (''mikrós''), meaning "small".
The symbol for it is the 'micro sign' µ, the Greek letter mu (μ). For historical reasons, these are two different characters in Unicode, which appear slightly different in some fonts. The micro sign is encoded in the "Latin-1 Supplement" range identical to ISO/IEC 8859-1 (since 1985), at U+00B5 (Unicode 1.0, 1991). The Greek letter is encoded in the Greek range at U+03BC.
In circumstances where only the Latin alphabet is available, the prefix is sometimes represented using the letter u as in "um" for µm, or "uV" for µV. In some contexts, such as pharmacy, micrograms are often written ''mcg''. Neither variant is standard.

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See also

★ microjoule

★ micrometre

★ square micrometre

★ microsecond