SI
#Physics #Chemistry
SI Prefixes
| Power | Symbol | Name | -illion |
|---|---|---|---|
| -30 | $\displaystyle \mathrm{q}$ | quecto | nonillionth |
| -27 | $\displaystyle \mathrm{r}$ | ronto | octillionth |
| -24 | $\displaystyle \mathrm{y}$ | yocto | septillionth |
| -21 | $\displaystyle \mathrm{z}$ | zepto | sextillionth |
| -18 | $\displaystyle \mathrm{a}$ | atto | quintillionth |
| -15 | $\displaystyle \mathrm{f}$ | femto | quadrillionth |
| -12 | $\displaystyle \mathrm{p}$ | pico | trillionth |
| -9 | $\displaystyle \mathrm{q}$ | nano | billionth |
| -6 | $\displaystyle \mathrm{\mu}$ | micro | millionth |
| -3 | $\displaystyle \mathrm{m}$ | milli | thousandth |
| -2 | $\displaystyle \mathrm{c}$ | centi | hundredth |
| -1 | $\displaystyle \mathrm{d}$ | deci | tenth |
| 1 | $\displaystyle \mathrm{da}$ | deca | ten |
| 2 | $\displaystyle \mathrm{h}$ | hecto | hundred |
| 3 | $\displaystyle \mathrm{k}$ | kilo | thousand |
| 6 | $\displaystyle \mathrm{M}$ | mega | million |
| 9 | $\displaystyle \mathrm{G}$ | giga | billion |
| 12 | $\displaystyle \mathrm{T}$ | tera | trillion |
| 15 | $\displaystyle \mathrm{P}$ | peta | quadrillion |
| 18 | $\displaystyle \mathrm{E}$ | exa | quintillion |
| 21 | $\displaystyle \mathrm{Z}$ | zetta | sextillion |
| 24 | $\displaystyle \mathrm{Y}$ | yotta | septillion |
| 27 | $\displaystyle \mathrm{R}$ | ronna | octillion |
| 30 | $\displaystyle \mathrm{Q}$ | quetta | nonillion |
Patterns
- Past $\displaystyle 10^{\pm 6}$, -illion usage starts and the metric prefix names end all in either "o" or "a"
- Past $\displaystyle 10^{6}$, capital letters are used for the metric prefix symbols
- Past $\displaystyle 10^{\pm 21}$, opposing lower and upper case symbols are used (e.g. $\displaystyle 10^{-21}$ is z while $\displaystyle 10^{21}$ is Z)