Mirror Object Tool
The Mirror Object Tool in the Multiple Objects Group is a tool that duplicates objects symmetrically based on a specified axis.
It is the same as the Mirror Object Tool in the Add Group, except that it can be applied to multiple objects at once.
참고
How it differs from the Mirror Object Tool in the Add Group
The Mirror Object Tool in the Misc Group is different in that it can only set the pivot position for the one model that is selected and being edited.