Set this advanced option to TRUE to use RD marks containing a circle rather than the text RD to indicate the zero point of dimensions when you use US Absolute dimension types. By default, RD marks contain the text RD. The default value is FALSE.
This advanced option is model specific and the setting is saved in the options databasedatabase file that contains the settings of model-specific general settings and advanced options
There are two options databases, the model options database (options_model.db) and the drawing options database (options_drawings.db).