Zetta
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Zetta (symbol Z) is an SI prefix indicating a factor of 1021 (one thousand trillion).
Adopted in 1991, it comes from the Latin septem, which means seven, as it is equivalent to 10007.
A prefix of the same value, Hepa, was introduced informally some years before the promulgation of zetta. It was formed from the Greek επτά («heptá»), which also means seven». It never received official acceptance and is now considered outdated.
In computing, zetta can mean 270, instead of 1021, especially when used as a byte prefix (zettabyte).
| 1000n | 10n | Prefix | Symbol | Short scale | Long scale | Decimal equity in the prefixes of the International System | Allocation |
|---|---|---|---|---|---|---|---|
| 100010 | 1030 | quetta- | Q | Nonillion | Quintillón | 1 000 000 000 000 000 000 000 000 | 2022 |
| 10009 | 1027 | ronna- | R | Eighth | Mil cuatrillones | 1 000 000 000 000 000 000 000 000 | 2022 |
| 10008 | 1024 | Yotta- | And | Septillion | Cuatrillón | 1 000 000 000 000 000 000 000 | 1991 |
| 10007 | 1021 | zetta- | Z | Sextillion | A thousand trillions | 1 000 000 000 000 000 000 | 1991 |
| 10006 | 1018 | exa... | E | Quintillón | Trillion | 1 000 000 000 000 000 000 | 1975 |
| 10005 | 1015 | peta... | P | Cuatrillón | A billion. | 1 000 000 000 000 000 | 1975 |
| 10004 | 1012 | tera- | T | Trillion | Billion | 1 000 000 000 000 | 1960 |
| 10003 | 109 | giga- | G | Billion | billion / billion | 1 000 000 000 | 1960 |
| 10002 | 106 | mega- | M | Million | 1 000 | 1960 | |
| 10001 | 103 | kilo- | k | Mil / Millar | 1 000 | 1795 | |
| 10002/3 | 102 | Hecto- | h | Hundred / Hundred | 100 | 1795 | |
| 10001/3 | 101 | deca- | da | Ten / Ten | 10 | 1795 | |
| 10000 | 100 | No prefix | One / Unit | 1 | |||
| 1000−1/3 | 10−1 | deci- | d | Tenth | 0.1 | 1795 | |
| 1000−2/3 | 10−2 | centi- | c | Centésimo | 0.01 | 1795 | |
| 1000−1 | 10−3 | mili- | m | A thousandth | 0.001 | 1795 | |
| 1000−2 | 10−6 | micro- | μ | Millions | 0.000 001 | 1960 | |
| 1000−3 | 10−9 | nano- | n | Billionth | One billion dollars | 0.000 000 001 | 1960 |
| 1000−4 | 10−12 | peak... | p | Trillonéimo | Billionth | 0.000 000 000 001 | 1960 |
| 1000−5 | 10−15 | femto- | f | Cuatrillonésimo | Milbillonésimo | 0.000 000 000 000 001 | 1964 |
| 1000−6 | 10−18 | Atto- | a | Quintillonésimo | Trillonéimo | 0.000 000 000 000 000 000 001 | 1964 |
| 1000−7 | 10−21 | zepto- | z | Sextillonésimo | Miltrillonésimo | 0.000 000 000 000 000 000 000 001 | 1991 |
| 1000−8 | 10−24 | Icto- | and | Septillonésimo | Cuatrillonésimo | 0.000 000 000 000 000 000 000 000 000 001 | 1991 |
| 1000−9 | 10−27 | red. | r | Eighth. | Milcuatrillonésimo | 0.000 000 000 000 000 000 000 000 000 000 001 | 2022 |
| 1000−10 | 10−30 | Quecto- | q | Nonillonésimo | Quintillonésimo | 0.000 000 000 000 000 000 000 000 000 000 000 001 | 2022 |
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