- MathWorld - Glossary of terms. Material ranges from undergraduate to research level.
-- https://mathworld.wolfram.com/
- Encyclopedia of Canadian Theatre - Thorough coverage of present and past theater news and productions.
-- https://www.canadiantheatre.com/
- 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.
-- https://www.edensterling.com/silvermarks.html
- Encyclopedia of Life Sciences - Originally commissioned and peer reviewed articles across the life sciences. Online encyclopedia requires paid subscription.
-- https://www.els.net/
- Symbols.com - An encyclopedia of over 2500 symbols. Search by keywords/concepts or by graphical attributes.
-- https://www.symbols.com/
- 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.
-- https://www.tbs-satellite.com/tse/online/
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