Appendix D: System and Dimension Variables
You can find a comprehensive listing of dimension variables in the AutoCAD help system. Here are instructions for finding the dimension variables information.
1. In AutoCAD, choose Help > AutoCAD Help Topics from the menubar
2. Click on the Contents tab in the Help dialog box then double click Command Reference
3. Double click on Command Reference, then again on System Variables
You will see a listing of system variables with a brief description to the right. You can click on the system variable name to get a more detailed description.