Very Small Units
c (centi) means “a hundredth of”.
m (milli) means “a thousandth of”.
? (micro) means “a millionth of”.
n (nano) means “a billionth of”.
p (pico) means “a trillionth of”.
Notes:
Capitalization is important! 1 Mm is NOT 1 mm.
Watch out for meters. Is ms milliseconds or meter seconds?