:: M = mega = 10**6
::  K = kilo = 10**3
::  m = milli = 10**-3
::  u = micro = 10**-6 (actually greek mu, but "u" is common for those
::      of us without greek letters on the keyboard)
::  n = nano = 10**-9
::  p = pico = 10**-12

Slightly off topic - I had a project redactored by a US hobby magazine 
because I used nF values rather than K's of pF.  I have found (about 
10 years ago) that some EE's in the US and Australia didn't use the 
nano descriptor, I was surprised when I was told it was a weird 
descriptor used by the the UK and Europe only. In fact, apart from 
Farnell and RS (for obvious reasons) no other supplier (at that time) 
used nano - .It is only recently that Jaycar and Tricky Dickies have 
listed capacitors in this way - Tandy (Radio Shack) never did.

I also prefer (though don't use) the older cycles per second for 
frequency than Hertz. I think the original far more explanatory and is 
more understandable a concept for beginners.

Colin
--
cdb, colin@btech-online.co.uk on 27/07/2009
 
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