How do I determine the drawing units (millimeters, inches, feet, or kilometers) of a drawing?

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Please find the article in our wiki. INSUNITS variable stores drawing units starting with AutoCAD 2000. Some vertical applications like Land Desktop Development store units in another way - in dictionaries probably because INSUNITS was not introduced yet by the moment. DWGUNITS command still exists for backward compatibility and note that it has an option to synchronize INSUNITS.