Naming for 10**k: k American European SI--Prefix -24 Yocto -21 Zepto -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 Myria (?) 6 Million Million Mega 9 Billion Milliard Giga In italy (Thousand Milliards) 12 Trillion Billion Tera 15 Quadrillion Billiard Peta 18 Quintillion Trillion Exa 21 Sextillion Trilliard Zetta 24 Septillion Quadrillion Yotta 27 Octillion Quadrilliard 30 Nonillion Quintillion (Noventillion) 33 Decillion Quintilliard 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 The American system is used in: US, ... The European system is used in: Austria, Belgium, Chile, Germany, the Netherlands, Italy (see exception) Scandinavia 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?

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