Quote:
Originally Posted by bloodhound31
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I have seen it written as (uM), but not as just (U). It's a small thing I know (pun intended) but has potential to leave people scratching their heads even more.. 
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It's actually pretty common.
The 'u' is used in place of the correct one where the descender(tail) is on the left, or 'μ' the greek letter 'Mu'
In electronics literature, μF (microfarads) is commonly shortened to just μ too.
hmmm, μtoo.... good name for a band