SI Numeric Prefixes
 
 
1000n 10n Prefix Symbol Short scale Long scale Decimal equivalent in SI writing style
10008 1024 yotta Y Septillion Quadrillion 1 000 000 000 000 000 000 000 000
10007 1021 zetta Z Sextillion Trilliard (thousand trillion) 1 000 000 000 000 000 000 000
10006 1018 exa E Quintillion Trillion 1 000 000 000 000 000 000
10005 1015 peta P Quadrillion Billiard (thousand billion) 1 000 000 000 000 000
10004 1012 tera T Trillion Billion 1 000 000 000 000
10003 109 giga G Billion Milliard (thousand million) 1 000 000 000
10002 106 mega M Million 1 000 000
10001 103 kilo k Thousand 1 000
10002⁄3 102 hecto h Hundred 100
10001⁄3 101 deca, deka da Ten 10
10000 100 (none) (none) One 1
1000-1⁄3 10-1 deci d Tenth 0.1
1000-2⁄3 10-2 centi c Hundredth 0.01
1000-1 10-3 milli m Thousandth 0.001
1000-2 10-6 micro µ (u) Millionth 0.000 001
1000-3 10-9 nano n Billionth Milliardth 0.000 000 001
1000-4 10-12 pico p Trillionth Billionth 0.000 000 000 001
1000-5 10-15 femto f Quadrillionth Billiardth 0.000 000 000 000 001
1000-6 10-18 atto a Quintillionth Trillionth 0.000 000 000 000 000 001
1000-7 10-21 zepto z Sextillionth Trilliardth 0.000 000 000 000 000 000 001
1000-8 10-24 yocto y Septillionth Quadrillionth 0.000 000 000 000 000 000 000 001
 
SI is from the French language name Système International d’Unités
See also this reference.
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