+9e1 is a numerical expression, typically representing the value ninety (90) within [scientific notation](/wiki/scientific_notation), where nine is multiplied by ten to the power of one. It signifies a specific [order of magnitude](/wiki/order_of_magnitude) often used in fields requiring concise representation of large or small numbers.
+## See also
+- [Number](/wiki/number)
+- [Decimal System](/wiki/decimal_system)
+- [Power of Ten](/wiki/power_of_ten)
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