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The "u" is actually the english replacement for the Greek letter mu, a u where the left vertical aspect of the "u" extends below the horizontal aspect.

It signifies micro- , mathematically 1/1,000,000th (one millionth) or 10 to the negative 6 (10 -6).

In this case, 9.1 um would be 9.1 micrometers, or 0.0000091 meters

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13y ago

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