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Subject: sci.math FAQ: Name of Large Numbers

This article was archived around: 17 Feb 2000 22:52:02 GMT

All FAQs in Directory: sci-math-faq
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Archive-name: sci-math-faq/largenumbers Last-modified: February 20, 1998 Version: 7.5
Names of Large Numbers Naming for 10^k. k American European SI--Prefix -33 revo -30 tredo -27 syto -24 fito -21 ento -18 quintillionth atto -15 Quadrillionth femto -12 trillionth pico -9 Billionth nano -6 Millionth micro -3 Thousandth milli -2 Hundredth centi -1 Tenth deci 1 Ten deca 2 Hundred hecto 3 Thousand kilo 4 Myriad 6 Million Million mega 9 Billion Milliard giga 12 Trillion Billion tera 15 Quadrillion Billiard peta 18 Quintillion Trillion exa 21 Sextillion Trilliard hepa 24 Septillion Quadrillion otta 27 Octillion Quadrilliard nea 30 Nonillion Quintillion dea (Noventillion) 33 Decillion Quintilliard una 36 Undecillion Sextillion 39 Duodecillion Sextilliard 42 tredecillion Septillion 45 quattuordecillion Septilliard 48 quindecillion Octillion 51 sexdecillion Octilliard 54 septendecillion Nonillion (Noventillion) 57 octodecillion Nonilliard (Noventilliard) 60 novemdecillion Decillion 63 VIGINTILLION Decilliard 6*n (2n-1)-illion n-illion 6*n+3 (2n)-illion n-illiard 100 Googol Googol 303 CENTILLION 600 CENTILLION 10^100 Googolplex Googolplex %From: balden@wimsey.com (Bruce Balden) %Date: Fri, 11 Oct 1996 12:46:39 GMT Chinese System 1 yi4 10 shi2 100 bai3 1000 qian2 10000 wan4 10^6 yi bai3 wan (i.e. 100 times wan) 10^8 yi1 10^12 ??? The American system is used in: US, ... The European system is used in: Austria, Belgium, Chile, Germany, the Netherlands, Italy (see exception) Scandinavia %Date: Mon, 25 Aug 1997 22:47:48 -0700 %From: Torbjorn Larsson <ekatla@eka.ericsson.se> %Subject: Sci.math FAQ Note that all prefixes are to be spelled with a leading small letter. (As are all SI units, even those that honors persons by using their names.) - All prefixes with n < 0 should have a small letter abbreviation. Eg. 1 picoampere = 1 pA. (SI unit rule explanation: person name unit is abreviated using a capital letter) - All prefixes with n > 0 should have a large letter abbreviation. Eg. 1 gigameter = 1 Gm. (SI unit rule explanation: non-person name unit is abreviated in lower case). _Except_ the mass unit: 1 kilogram is abreviated as kg (compare to Km. for kilometer). hv@cix.compulink.co.uk (Hugo van der Sanden): To the best of my knowledge, the House of Commons decided to adopt the US definition of billion quite a while ago - around 1970? - since which it has been official government policy. dik@cwi.nl (Dik T. Winter): The interesting thing about all this is that originally the French used billion to indicate 10^9, while much of the remainder of Europe used billion to indicate 10^12. I think the Americans have their usage from the French. And the French switched to common European usage in 1948. gonzo@ing.puc.cl (Gonzalo Diethelm): Other countries (such as Chile, my own, and I think most of Latin America) use billion to mean 10^12, trillion to mean 10^18, etc. What is the usage distribution over the world population, anyway? -- Alex Lopez-Ortiz alopez-o@unb.ca http://www.cs.unb.ca/~alopez-o Assistant Professor Faculty of Computer Science University of New Brunswick