+"5e9" denotes five billion (5,000,000,000), a [large number](/wiki/Large_Number) frequently observed in contexts such as [astronomy](/wiki/Astronomy) and population studies. This exponential notation signifies a profound scale, often representing immense quantities or vast distances.
+## See also
+- [Scientific Notation](/wiki/Scientific_Notation)
+- [Orders of Magnitude](/wiki/Orders_of_Magnitude)
+- [Exponents](/wiki/Exponents)
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