/VUP, WN, Label
Specifies the global Cartesian coordinate system reference orientation.
WNWindow number (or ALL) to which command applies (defaults to 1).
LabelOrientation:
Y  | —  | Y vertical upward, X horizontal to the right, Z out from the screen (default).  | 
-Y  | —  | Y vertical downward, X horizontal to the left, Z out from the screen.  | 
X  | —  | X vertical upward, Y horizontal to the left, Z out from the screen.  | 
-X  | —  | X vertical downward, Y horizontal to the right, Z out from the screen.  | 
Z  | —  | Z vertical upward, Y horizontal to the right, X out from the screen. With this choice, you should use a view other than the /VIEW default of (0,0,1).  | 
-Z  | —  | Z vertical downward, Y horizontal to the left, X out from the screen. With this choice, you should use a view other than the /VIEW default of (0,0,1).  |