Shrinks the current selection, deselecting anything that has an unselected adjacency. In geometry select modes, this works by deselecting all vertices that are either connected to at least one deselected face, or not connected to any selected faces. In bone select modes, this works by deselecting all bones which do not have a selected parent or child. The opposite of [link=select_more]Select More[/link], though applying one operation after the other will not necessarily result in the starting selection.