The units for PaperSize and PrintableBounds.
[Visual Basic .NET] Public ReadOnly Property Units As esriUnits
[C#] public esriUnits Units {get;}
[C++]
HRESULT get_Units(
esriUnits* Units
);
[C++]Parameters
Units [out, retval]Units is a parameter of type esriUnits
Product Availability
Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.