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micro- is a SI Prefix in the SI system of Unit s denoting a factor of 10−6 (one Million th). The symbol for it is the Micro Sign (µ). In circumstances where only the Latin Alphabet is available, it is customarily written using the letter U . E.g. um for µm, or uV for µV. Occasionally, micrograms are written as ''mcg''.

Confirmed in 1960 , the prefix comes from the Greek μικρός (transliterated: mik''ros''), meaning ''small''.

More generally, the prefix means "very small".


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