Wikipedia (English)
English edition of the well-known free wikipedia encyclopedia.
http://en.wikipedia.org
Wikipedia (Deutsch)
Deutsche Ausgabe der bekannten freien Enzyklopädie Wikipedia.
http://de.wikipedia.org
Answers.com
Searches several online encyclopedias and dictionaries simultaneously and lists the results clearly arranged.
http://www.answers.com
About.com
A rich source with many detailed articles.
http://www.about.com
Acronym Finder
If you wonder what an acronym stands for: here is the answer. Also allows to search using wildcards, as well as to run a reverse search to find an acronym corresponding to a specific keyword. Claims to be the worlds largest dictionary of its kind.
http://www.acronymfinder.com
Symbols.com
Online encyclopedia of western signs and ideograms. Provides a graphic index to search for the meaning of a sign, and a word index to find a sign with a certain meaning.
http://www.symbols.com
Glossary Crawler
Finds online glossaries that explain a certain term.
http://www.glossary-crawler.org
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