Unit prefixes are used to reduce the characters needed to represent a number.
They are available to check in the data booklet but should ideally be memorized for speed.
Unit prefixes are written immediately in front of the unit (without a space). Apart from the kilo (k), an uppercase prefix represents a large number and lowercase prefixes represent small numbers.
| Prefix | Value | Power of 10 |
| T (tera) | 1000,000,000,000 | 12 |
| G (giga) | 1000,000,000 | 9 |
| M (mega) | 1000,000 | 6 |
| k (kilo) | 1000 | 3 |
| c (centi) | 0.01 | -2 |
| m (milli) | 0.001 | -3 |
| μ (micro) | 0.000001 | -6 |
| n (nano) | 0.000000001 | -9 |
| p (pico) | 0.000000000001 | -12 |
| f (femto) | 0.000000000000001 | -15 |
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