SI Prefixes
SI prefixes are used to form decimal multiples and submultiples of SI units.
They should be used to avoid very large or very small numeric values.
The prefix attaches directly to the name of a unit, and a prefix symbol attaches directly to the symbol for a unit.
| Multiplying Factor | SI Prefix | Scientific Notation |
| 1 000 000 000 000 000 000 000 000 | yotta (Y) | 1024 |
| 1 000 000 000 000 000 000 000 | zetta (Z) | 1021 |
| 1 000 000 000 000 000 000 | exa (E) | 1018 |
| 1 000 000 000 000 000 | peta (P) | 1015 |
| 1 000 000 000 000 | tera (T) | 1012 |
| 1 000 000 000 | giga (G) | 109 |
| 1 000 000 | mega (M) | 106 |
| 1 000 | kilo (k) | 103 |
| 0.001 | milli (m) | 10-3 |
| 0.000 001 | micro (µ) | 10-6 |
| 0.000 000 001 | nano (n) | 10-9 |
| 0.000 000 000 001 | pico (p) | 10-12 |
| 0.000 000 000 000 001 | femto (f) | 10-15 |
| 0.000 000 000 000 000 001 | atto (a) | 10-18 |
| 0.000 000 000 000 000 000 001 | zepto (z) | 10-21 |
| 0.000 000 000 000 000 000 000 001 | yocto (y) | 10-24 |