Function Description:
The UCSBASE system variable is used to store the the name of UCS that defined the original point and direction for ortho UCS settings.
Type : Strings 
Saved in : Drawing 
Initial value : ""
The valid value could be any named UCS.
											  Article ID: 1894
											  Created: July 28, 2021
											  Last Updated: July 28, 2021
											  Author: GstarCAD MY /KW
											
Online URL: https://kb.gstarcad.com.my/article/ucsbase-system-variable-1894.html