http://www.infotoday.com/newsbreaks/nb050531-1.shtml
"Zoom is actually a concept navigation tool that offers users suggestions to narrow and refine a search ('zooming in'), or expand a search ('zooming out'). It can also identify specific names related to a search. Zoom is visually represented on the results page with suggestions that are categorized on the right side of the page into Narrow Your Search, Expand Your Search, and Related Names. "
