An encyclopedia or encyclopaedia, also (rarely) encyclopædia,Owing to differences in British and American English orthographic conventions, the spellings encyclopaedia and encyclopedia both see common use, in British-/Commonwealth- and American-influenced sources, respectively. The spelling encyclopædia – with the æ ligature – was frequently used in the 19th century and is increasingly rare, although it is retained in product titles such as Encyclopædia Britannica and others. The Oxford English Dictionary and Webster's Third New International Dictionary record both spellings: the former (1989) notes the æ would be obsolete except that it is preserved in works that have Latin titles, while the latter (1961-2002) notes that the digraph is rare in the U.S. Similarly, cyclopaedia and cyclopedia are rarely used truncations of the word originating in the early 17th century. is a comprehensive written compendium that contains information on all branches of knowledge or a particular branch of knowledge.
For a list of notable encyclopedias in history, see list of encyclopedias.

Symbols.com - An encyclopedia of over 2500 symbols. Search by keywords/concepts or by graphical attributes.
Meta Description: [ Welcome to the World's Largets Online Encyclopedia of Western Signs and Ideograms. ]
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Canadian Music Encyclopedia - Chronicles the history of many Canadian contemporary music artists from the 1950's to the present.
Meta Description: [ CANOE - Your Internet network ]
Creation-Evolution Encyclopedia - Over 700 printed pages of material discussing the controversy between creation and evolution.
Meta Description: [ Scientific evidence proves that creation, not evolution is the only viable explanation for the origin of life. Here you will find facts and statements from scientists, most of whom are evolutionists, validating this claim. Literally hundred's of pages in length, this is the most exhaustive resour... ]
Cyclepedia: Motorcycle Information - Motorcycling information, repair manuals, technical data, and useful statistics organized by manufacturer. Completely searchable and easy to use.
Meta Description: [ Cyclepedia Press LLC - Online Service Repair Manuals for ATVs and Motorcycles ]
Encyclopaedia of Land Surveying Links - Alphabetical list of links to land surveying, geodesy, GPS, GIS, and related fields most specific to the Southern California Land Surveying Environment.
Encyclopedia Mythica - Over 6,000 entries on mythology, folklore, and legend. Includes some images and stories.
Meta Description: [ The premier encyclopedia on mythology, folklore, and religion. ]
Encyclopedia of American Silver Marks - This site contains identification of marks of American Silver Manufacturers including Gorham, Tiffany, Towle, Duhme, Wallace, Lunt, and Watson. All marks are clearly illustrated and include a short history of each company. Links to other silver collecting sites are provided.
Meta Description: [ This is a collection of marks from American silver manufacturers such as Unger Brothers, Tiffany, Gorham, Shiebler, Duhme, Whiting,duhme, towle,Lunt, Kirk, etc. ]
Encyclopedia of Canadian Theatre - Thorough coverage of present and past theater news and productions.
Meta Description: [ Canadian Encyclopedia of Theatre ]
Encyclopedia of Life Sciences - Originally commissioned and peer reviewed articles across the life sciences. Online encyclopedia requires paid subscription.
Encyclopedia of Trotskyism On-Line (ETOL) - A resource center for the study of the international Trotskyist movement.
Meta Description: [ History of Trotskyism ]
EngineersWorldwide.com - Worldwide directory for the design, engineering and construction industries.
Meta Description: [ Design and Build Anything, Anywhere! The Internet's most complete directory for the design-build industry. ]
Kyoto Encyclopedia of Genes and Genomes - Current knowledge of molecular and cellular biology in terms of the information pathways of interacting molecules or genes and links from the gene catalogs produced by genome sequencing projects.
MathWorld - Glossary of terms. Material ranges from undergraduate to research level.
Natural Remedies Encyclopedia - Natural Remedies for over 500 diseases, such as cancer, heart disease, sexually transmitted diseases, childhood diseases, with a special section on preventive health.
Meta Description: [ Health care is a multi-billion dollar industry that too often relieves you of your money, but not your illness. America has the highest health care costs in the world, but the quality of care and the results of treatment is vastly inferior to many other first world countries. Treat yourself natur... ]
Peakware World Mountain Encyclopedia - Includes reference information such as height, location, first ascent data, photos, web links, summit log entries for hundreds of mountains worldwide.
Meta Description: [ Peakware is the web's preimier mountain and mountaineering resource, featuring descriptions, photos, maps, summit logs, guidebooks and more. ]
Storm Encyclopedia - Covers the basics about severe storms with notable examples of Mother Nature's ill-tempered handiwork.
Tallship Fan - Encyclopedia of sailing ships online: data, photos, history, contact addresses and other information about traditionally rigged sailing ships.
Meta Description: [ Sailing ships online: encyclopedia with data, photos, history, contact addresses and much more infos about traditional rigged sailing ships ]
Technology and 20th Century Change In Warfare -
The Book of Threes - Read and contribute on the both natural and unnatural occurrences or the number three.
Meta Description: [ The Book of Threes - A Subject Referrence Tricyclopedia. The concept is simple. Just think of something that comes in threes, then go to this site and contribute it. ]
The Satellite Encyclopedia - The Satellite Encyclopedia contains fact sheets with basic information such as launch date, country of origin, official identification, and payload description (EIRP maps). Extended launch vehicle section. Future satellites descriptions. Over 4000 pages and 9000 keywords.
Meta Description: [ The Satellite Encyclopedia is a technical reference containing information on 2000 satellites. Multiple thematic listings (country, launcher, purpose). Technical specifications such as transponder frequency chart, uplink and downlink, G/T EIRP maps, space launch log. ]
Virtualsources.com - Find information on every country in the world. There are massive amounts of statistics on everything from population to a country's legal system.
Meta Description: [ Information and Resources - Africa, Asia, Australia and Oceania, Europe, Latin America, Middle East, North America ]
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