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>What number would come after Octillion ? In my desktop dictionary, there's a table under "numeration" (got there by looking up 'quintillion') which says the following: million = 1000 thousands milliard = 1000 millions (French) = billion (U.S.) trillion = 1000 billions or 1,000,000 millions quadrillion quintillion sextillion septillion octillion nonillion decillion undecillion duodecillion tredecillion quattuordecillion qundecillion sexdecillion etc. Using scientific notation (with 10^3 is read "10 to the 3rd power"): thousand = 10^3 million = 10^6 billion = 10^9 trillion = 10^12 etc. Metric prefixes: 10^12 = tera (e.g. a terameter is one trillion meters, more than 10 million times the distance from the earth to the sun!) 10^9 = giga (commonly used now to describe the capacity of computer hard drives -- e.g. 2 gigabytes = 2 billion individual characters of information, with a character being one letter or digit) 10^6 = mega (one floppy disk holds 1.4 megabytes of information) Joyce Conklin jconkli@ed.co.sanmateo.ca.us San Mateo Union High School Dist. (ret.) San Mateo CA