Micro-

Micro (Greek letter μ, mu, non-italic) is a unit prefix in the metric system denoting a factor of 10−6 (one millionth). Confirmed in 1960, the prefix comes from the Greek μικρός (mikrós), meaning "small".

This article is about the SI prefix. For other uses, see Micro (disambiguation).
Look up micro- in Wiktionary, the free dictionary.

It is the only SI prefix which uses a character not from the Latin alphabet. In Unicode, the symbol is represented by U+03BC μ or the legacy symbol U+00B5 µ . The prefix "mc" is commonly used in healthcare or when the character "μ" is not available; for example, "mcg" commonly denotes a microgram. The letter "u" is sometimes used instead of "μ" when non-Latin characters are not available.

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