Constrains cursor movement to the perpendicular.
| Type: | Integer | 
| Saved in: | Drawing | 
| Initial value: | 0 | 
When ORTHOMODE is turned on, the cursor can move only horizontally or vertically relative to the UCS and the current grid rotation angle
| Value | Description | 
|---|---|
| 0 | Turns off Ortho mode | 
| 1 | Turns on Ortho mode |