what is this abbreviation?

insulin is measured in units, so I am thinking a milliunit would be a thousandth of a unit.

what is a milliunit - mu and when is it used?

(i tried to find it in a medical dictionary)

http://www.bookrags.com/sciences/chemistry/metric-system-woc.html

>>many of the si units can be divided by the use of an appropriate modifier. for example a tenth of a unit is a deciunit, one hundredth is a centiunit, a thousandth is a milliunit, and a millionth is a microunit. multiplication of units works in a similar manner such that a kilounit is one thousand units and a megaunit is one million units. for convenience in normal speech some of these units are not used, instead older, imperial measurements are used. for example some countries use inches, feet, and miles instead of meters and the units derived from the meter.

thanks

I know that milli (whether milligram, millilitre, millimeter) is a thousandth of the measurement term