

Upper and lower case are different! 1 Mm is significantly different from 1 mm;
More information on metric units of measurement and conversions is available from the National Institue of Standards and Technology (NIST)
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Some pronounce it "Jiga" (soft "g"), while others
prounounce it "Giguh" (with a hard "g"). Either is correct.
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µ is the greek letter "mu". If you don't have this symbol available you
can sortof get by using the Roman "u" instead, but keep in mind that
"mu" is the greek letter for "m".
The following are not a part of the International System of Units (SI), but they may be amusing. :)
(Note: 10^12 means 10 raised to the 12th power, and so on) 10^12 Microphones = 1 Megaphone 10^6 bicycles = 2 megacycles 500 millenaries = 1 seminary 2000 mockingbirds = two kilomockingbirds 10 cards = 1 decacards 1/2 lavatory = 1 demijohn 10^6 fish = 1 microfiche 453.6 graham crackers = 1 pound cake 10^12 pins = 1 terrapin 10^21 piccolos = 1 gigolo 10 rations = 1 decoration 100 rations = 1 Cration 10 millipedes = 1 centipede 3 1/3 tridents = 1 decadent 10 monologs = 5 dialogues 5 dialogues = 1 decalogue 2 monograms = 1 diagram 8 nickles = 2 paradigms 2 snake eyes = 1 paradise 2 wharves = 1 paradox 1 milliHelen = the amount of beauty required to launch a single ship 