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1,000,000,000 is the number equal to a thousand million. Written in scientific notation, it is 10^9. In everyday English, it is commonly called a billion, but this word can also mean 10^12 depending on region, and it is avoided in science and astronomy. Sometimes it is simply referred to as a thousand million. In a proposed (but not practically used) numbering system called Rowlett, it is a gillion. 1E09
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