some prefixes for powers of 10 used with metric units

10^-18

atto (a)

10^-15

femto (f)

10^-12

pico (p)

10^-9

nano (n)

10^-6

micro (u)

10^-3

milli (m)

10^-2

centi (c)

10^-1

deci (d)

10^1

deka (da)

10^3

kilo (k)

10^6

mega (M)

10^9

giga (G)

10^12

tera (T)

10^15

peta (P)

10^18

exa (E)