Template:Blender 3D: HotKeys/3D View/Edit Mode/BKEY BKEY
BKEY BKEY - (Pre-Blender-2.5) Circle Select. Use NUM+ to increase, NUM- to decrease, or MW to adjust the circle size. Drag over vertices/edges/faces with LMB to add them to selection, MMB to remove them from selection. Leave Circle Select with RMB or ESC.