based on grams, though grams can be replaced with any base unit (meters, etc).
giga-gram (G-g)
1,000,000,000 grams (1 billion) in 1 __
mega-gram (M-g)
1,000,000,000 grams (1 million) in 1 __
kilo-gram (k-g)
1,000 grams in 1 __
deci-gram (d-g)
10 __ in 1 gram
centi-gram (c-g)
100 __ in 1 gram
milli-gram (m-g)
1,000 __ in 1 gram
micro-gram (µ-g)
1,000,000 (1 million) __ in 1 gram
nano-gram (n-g)
1,000,000,000 (1 billion) __ in 1 gram