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Micro-Trains Line (MTL)
Micro- is a prefix in the SI and other systems of units denoting a factor of 10−6 (one millionth). The symbol for it is the micro sign (µ), the Greek letter mu (μ) (there are two different symbols in Unicode, which appear slightly different in some fonts). more...
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In circumstances where only the Latin alphabet is available, the SI standard allows representation of the prefix using the letter u as in um for µm, or uV for µV. In some contexts, such as pharmacy, micrograms are often written mcg.
Confirmed in 1960, the prefix comes from the Greek μικρός (transliterated: mikros), meaning small.
More generally, the prefix means "very small".
Read more at Wikipedia.org
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