| Multiple | Standard Form | Unit Prefix | Symbol |
|---|---|---|---|
| 1018 | exa | E | |
| 1015 | peta | ||
| 1012 | tera | ||
| 109 | giga | ||
| 106 | 1,000,000 (one million) | mega | |
| 103 | kilo | ||
| 102 | hecto | ||
| 101 | deka | ||
| 100 | - | ||
| 10-1 | deci | ||
| 10-2 | centi | ||
| 10-3 | milli | ||
| 10-6 | micro | ||
| 10-9 | nano | ||
| 10-12 | pico | ||
| 10-15 | femto | ||
| 10-18 | atto |
The 2.54-centimeter worm! Image credit to Keith Edkins of Wikimedia Commons.