+**7e9** is a concise way to express the number seven [billion](/wiki/Billion) (7,000,000,000), commonly found in [scientific notation](/wiki/Scientific_Notation). This format is used to simplify the writing and calculation of very large quantities across many scientific and engineering disciplines. It indicates a base value of 7 multiplied by 10 to the power of 9.
+## See also
+- [Exponents](/wiki/Exponents)
+- [Large Numbers](/wiki/Large_Numbers)
+- [Order of Magnitude](/wiki/Order_of_Magnitude)
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