+**12e9** is a numerical expression representing twelve billion (12,000,000,000). It is a concise form of [Scientific Notation](/wiki/scientific_notation), indicating a [Number](/wiki/number) of immense scale. This representation is commonly used to express large quantities in various scientific and engineering disciplines.
+## See also
+- [Billion](/wiki/billion)
+- [Magnitude](/wiki/magnitude)
+- [Exponent](/wiki/exponent)
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