Symmetry
"Symmetry is a set of max 4 functions and macroscripts (ActionItems) meant for usage in the QuadMenus - Toolbars or as Shortcuts. It was rewritten from scratch and is many hundred times faster - but is very similar in its functionality to the old Symmetry script for MAX R3. It will let you select (automatically or manually) the symmetrical sub-object elements (vertices - edges and faces) while modeling with polygons (esp. characters for SubDiv modeling) "