Creating 3D Geometry - AutoCAD 2011 and AutoCAD LT 2011: No Experience Required - page 848

FiGuRE 16.20 Use the first right-hand rule to identify x-, y-, and z-axes.
The Move grip tool appears at the center of the box, as shown in
Figure 16.21. Note the different color arrows that make up the 3D
move tool; the color of each arrow matches the RGB = XYZ conven-
tion used for the 3D UCS icon.
3. Move the cursor over each of the colored axes of the Move grip tool and
notice that the axis turns yellow to indicate that it is current and a vector
appears in line with the axis, as shown in Figure 16.22. When a vector is
visible, all movements, either indicated with the cursor and a mouse click
or input from the keyboard, are constrained to the axis indicated.