+3e9, or three billion, is a [scientific notation](/wiki/scientific_notation) representing a vast quantity. It often appears when discussing large-scale data, astronomical distances, or the sheer [number](/wiki/number) of entities on a global scale.
+## See also
+- [Billion](/wiki/billion)
+- [Order of Magnitude](/wiki/order_of_magnitude)
+- [Large Numbers](/wiki/large_numbers)
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