Definitions for "I.S.O"
International Standards Organization. An organization whose mission is to develop and provide acceptable industry-wide product standards for international use.
Among other responsibilities, they establish viscosity standards for industrial oils. Viscosity is measured in centistokes at 40┬░Celsius. This method is known as Kinematic Viscosity.
International Standards Organization which deals in standards of all sorts, ranging from documentation to equipment packaging and labeling.