Micro- (symbol µ) 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  (), meaning "small".

Micro- (symbol µ) 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  (), meaning "small".