Autodesk AUTOCAD 2006 Command Reference Manual page 689

Object
Uses the plane of a selected planar object as the mirroring plane.
Select a circle, arc, or 2D-polyline segment:
Delete source objects? [Yes/No] <N>: Enter y or n , or press ENTER
If you enter y, the reflected object is placed into the drawing and the original
objects are deleted. If you enter n or press ENTER , the reflected object is
placed into the drawing and the original objects are retained.
select object as
mirroring plane
Last
Mirrors the selected objects about the last defined mirroring plane.
Delete source objects? [Yes/No] <N>: Enter y or n , or press ENTER
If you enter y, the reflected object is placed into the drawing and the original
objects are deleted. If you enter n or press ENTER , the reflected object are
placed into the drawing and the original objects are retained.
Z Axis
Defines the mirroring plane by a point on the plane and a point normal to
the plane.
Specify point on mirror plane: Specify a point (1)
Specify point on Z-axis (normal) of mirror plane: Specify a point (2)
Delete source objects? [Yes/No] <N>: Enter y or n , or press ENTER
If you enter y, the reflected object is placed into the drawing and the original
objects are deleted. If you enter n or press ENTER , the reflected object are
placed into the drawing and the original objects are retained.
MENULOAD Command Line | 665