"ul" might refer to microliter, same as cubic millimeter. When there are technical difficulties to show the "mu" symbol, it may be replaced by the letter "u", which looks somewhat similar.
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unit of measurement
The exponent is a characteristic of a number. A measurement unit does not have an exponent. Since a metre is a measurement unit, it does not have an exponent.
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There is no such unit of measurement as a "decimal". The unit is therefore equal to itself in the same measurement.
Megabyte