UCSICON
Controls the visibility and placement of the UCS icon
View menu: Display
➤
UCS Icon
Command line:
ucsicon
The UCS icon represents the orientation of the user coordinate system (UCS)
axes and the location of the current UCS origin. It also represents the current
viewing direction relative to the XY plane.
A UCS can be stored with a viewport if the UCSVP system variable is set to 1
for that viewport.
Different coordinate system icons are displayed in paper space and model
space. In both cases, a plus sign (+) appears at the base of the icon when it is
positioned at the origin of the current UCS. The letter W appears in the Y
portion of the icon if the current UCS is the same as the world coordinate
system.
With the 3D UCS icon, a square is displayed in the XY plane at the origin
when the UCS is the same as the world coordinate system.
A box is formed at the base of the icon if you are viewing the UCS from above
(the positive Z direction). The box is missing if you are viewing the UCS from
below.
With the 3D UCS icon, the Z axis is solid when viewed from above the XY
plane and dashed when viewed from below the XY plane.
If the UCS is rotated so that the Z axis lies in a plane parallel to the viewing
plane—that is, if the XY plane is edge-on to the viewer—the 2D UCS icon is
replaced by a broken pencil icon.
The 3D UCS icon does not use a broken pencil icon.
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