| SI Prefix | Symbol | Amount | Since | Notes | Obsolete | Bogus |
|---|---|---|---|---|---|---|
| 10^+33 | una- | |||||
| 10^+30 | dea- | |||||
| 10^+27 | nea- | |||||
| yotta-, yota- | Y | 10^+24 | 1991 | Next-to-last letter of the Latin alphabet Y -> Greek iota | otta- | |
| zetta-, zeta- | Z | 10^+21 | 1991 | Last letter of the Latin alphabet Z -> Greek zeta | hepa- | |
| exa- | E | 10^+18 | 1975 | 18 = 6 * 3 -> six = Greek hex -> Hexa - H = exa | ||
| peta- | P | 10^+15 | 1975 | 15 = 5 * 3 -> five = Greek pente -> peNta - N = peta | ||
| tera- | T | 10^+12 | 1960 | Greek teras = monster | megamega- (MM) | |
| giga- | G | 10^+9 | 1960 | Latin gigas = giant | kilomega- (kM) | |
| mega- | M | 10^+6 | Ή | Greek megas = great | ||
| 10^+5 | hectokilo- (hk) | |||||
| 10^+4 | 1795 | myria- (ma, my) | ||||
| kilo- | k | 10^+3 | 1793 | Greek khilioi = 1000 | ||
| hecto- | h | 10^+2 | 1793 | |||
| deca-, deka- | da | 10^+1 | 1793 | dk | ||
| 10^0 | ||||||
| deci- | d | 10^-1 | 1793 | |||
| centi- | c | 10^-2 | 1793 | |||
| milli- | m | 10^-3 | 1793 | |||
| 10^-4 | decimilli-, dimi- (dm) | |||||
| 10^-5 | centimilli- (cm) | |||||
| micro- | ΅ | 10^-6 | Greek mikros = small | |||
| nano- | n | 10^-9 | 1960 | Greek nanos = little old man, dwarf | millimicro- (m΅) | |
| pico- | p | 10^-12 | 1960 | Spanish pico = beak, small quantity | micromicro- (΅΅) | |
| femto- | f | 10^-15 | 1964 | Danish or Norwegian femten = fifteen | ||
| atto- | a | 10^-18 | 1964 | Danish or Norwegian atten = eighteen | ||
| zepto- | z | 10^-21 | 1991 | ento- | ||
| yocto-, yokto- | y | 10^-24 | 1991 | fito- | ||
| 10^-27 | syto- | |||||
| 10^-30 | tredo- | |||||
| 10^-33 | revo- |
Ή: Used c.1870; legal in France since 1919
College of Chemistry, University of California, Berkeley: Metric Prefixes
ThinkQuest: ChemistReality: Conversion Factor Table
Bureau International des Poids et Mesures (BIPM): The International System of Units (SI) prefixes
How Many? A Dictionary of Units of Measurement: Metric Prefixes
California Institute of Technology: Roy Williams: Etymology of Units
The San Diego Supercomputer Center (SDSC): The peta- principle by Jim Binder
A Dictionary of Measures, Units and Conversions (See: The Prefixes of the SI)
Hallym Univ. Dept. of Physics: Metric Prefixes & Number Names
http://ourworld.compuserve.com/homepages/Old_tools/units.htm [The page cannot be found]
http://www.dlsc.dla.mil/fiigs/A010B/chart1.htm [The page cannot be displayed]
http://pages.prodigy.com/J/T/L/jtbagwell/power10t.htm [The page cannot be found]
http://nmsmn.com/~cservin/jargon/q/quantifiers.html [The page cannot be displayed]
U.S. Metric Association (USMA), Inc. (Lots of links)
sci.math FAQ: Name of Large Numbers
James Riordan, University of Minnesota: Metric Prefixes
PetaHertz: Systeme International (SI) prefixes for large and small numbers
EDR (Eksperimenterende Danske Radioamatψrer) VHF Committee: SI Prefixes