Prefixes for units of measurement
In all tables, the valid identifiers for units that can be used in TOP-Energy are highlighted in bold type.
SI Prefixes
SI prefixes are decimal prefixes defined for use in the International System of Units (SI). They are based on powers of ten with integer exponents. Both the name and the internationally uniform symbol can be used as identifiers.
| Identifier (name) | Identifier (symbol) | Comment | Definition |
|---|---|---|---|
| yotta | Y | Greek or Latin: octo (eight) | 1024 |
| zetta | Z | Latin: septem (seven) | 1021 |
| exa | E | Greek: hex (six) | 1018 |
| peta | P | Greek: pente (five) | 1015 |
| tera | T | Greek: teras (monster) | 1012 |
| giga | G | Greek: gigas (gigantic) | 109 |
| mega | M | Greek: megas (large) | 106 |
| myria | No official SI unit. | 104 |
|
| kilo | k | Greek: chilioi (thousand) | 103 |
| hecto | h | Greek: hekaton (hundred) | 102 |
| deca | da | Greek: deka (ten) | 101 |
| deka | da | Greek: deka (ten) | 101 |
| deci | d | Latin: decimus (tenth) | 10-1 |
| centi | c | Latin: centum (hundred) | 10-2 |
| milli | m | Latin: mille (thousand) | 10-3 |
| micro | Latin: micro or Greek: mikros (small) | 10-6 |
|
| nano | n | Latin: nanus or Greek: nanos (dwarf) | 10-9 |
| pico | p | Spanish: pico (a little) | 10-12 |
| femto | f | Danish or Norwegian: femten (fifteen) | 10-15 |
| atto | a | Danish or Norwegian: atten (eighteen) | 10-18 |
| zepto | z | Latin: septem (seven) | 10-21 |
| yocto | y | Greek or Latin: octo (eight) | 10-24 |
Further Prefixes
Some other prefixes are used, for example, as prefixes for monetary units.
| Identifier | Comment | Definition |
|---|---|---|
| Mrd | billions | 109 |
| Mio | millions | 106 |
| triple | 3 |
|
| treble | 3 |
|
| double | 2 |
|
| semi | 0,5 |
|
| demi | 0,5 |
|
| hemi | 0,5 |
|
| half | 0,5 |
|
| quarter | 0,25 |
