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Zeitgeist- The word is a combination of two German words: Zeit (time) + Geist (spirit,) which means the spirit of time; the taste and trends of a period or generation. Google's Zeitgeist is one of its unique services, which offers information on interesting search trends, patterns and statistics; which are automatically generated from millions of search results carried out on Google over a given period of time; you can say on weekly, monthly, annually basis. Google provides both global and nation wise popular search report.
Zone - Some search engines allow users to check a search to particular zones, as Google provides WWW search and nation-wise search facilities.
Zworks- Metasearch engine located at www.zworks.com.