Unit and Dimensions
4.0 SI prefixes
4.0 SI prefixes
A SI prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or sub-multiple of the unit.
Each prefix has a unique symbol that is preceded to any unit symbol.
| Prefix | Power of $10$ | Symbol |
| atto | $-18$ | $a$ |
| femto | $-15$ | $f$ |
| pico | $-12$ | $p$ |
| nano | $-9$ | $n$ |
| micro | $-6$ | $\mu$ |
| milli | $-3$ | $m$ |
| centi | $-2$ | $c$ |
| deci | $-1$ | $d$ |
| deka | $1$ | $da$ |
| hecto | $2$ | $h$ |
| kilo | $3$ | $k$ |
| mega | $6$ | $M$ |
| giga | $9$ | $G$ |
| tera | $12$ | $T$ |
| peta | $15$ | $P$ |
| exa | $18$ | $E$ |
