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EncyclopediaPrefixes for Basic Metric Units|
| deka- or deca- | da | 101 | ten | | hecto- | h | 102 | hundred | | kilo- | k | 103 | thousand | | mega- | M | 106 | million | | giga- | G | 109 | billion | | tera- | T | 1012 | trillion | | peta- | P | 1015 | quadrillion | | exa- | E | 1018 | quintillion | | zetta- | Z | 1021 | sextillion | | yotta- | Y | 1024 | septillion | |
| deci- | d | 10-1 | tenth | | centi- | c | 10-2 | hundredth | | milli- | m | 10-3 | thousandth | | micro- | μ | 10-6 | millionth | | nano- | n | 10-9 | billionth | | pico- | p | 10-12 | trillionth | | femto- | f | 10-15 | quadrillionth | | atto- | a | 10-18 | quintillionth | | zepto- | z | 10-21 | sextillionth | | yocto- | y | 10-24 | septillionth | The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved.
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