Prefixes are attached to the front of units or other measures to communicate their relative size. This page is a resource on what the different unit prefixes are. Note that these prefixes apply before exponents (ex. centimeter or megawatt). So a 2 cm3 is the same as 2 (cm)3 and is therefore 2 millionths of a m3 rather than 1 hundredth of a m3.

Prefix Value Name
Peta 1015 Quadrillion
Tera- 1012 Trillion
Giga- 109 Billion
Mega- 106 Million
Kilo- 103 Thousand
- 100 One
Deci- 10-1 Tenth
Centi- 10-2 Hundredth
Milli- 10-3 Thousandth
Micro- 10-6 Millionth
Nano- 10-9 Billionth
Pico- 10-12 Trillionth
Femto- 10-15 Quadrillionth

For Further Reading