U- Pref. Written Shorthand For Micro-; Techspeak When Applied To Metric Units, Jargon When Used Otherwise.

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u- pref.

Written shorthand for micro-; techspeak when
applied to metric units, jargon when used otherwise. Derived from
the Greek letter
"mu",
the first letter of "micro" (and which
letter looks a lot like the English letter "u").

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