A graph with vertices that are linked to concepts and edges that represent relations such as "is like" or "includes".  Visual Tour function of this WikiWiki shows a portion of the knowledge, the Knowledge Mapping science abbreviates to KM.

An extensive repository of KM topics: http://www.voght.com/cgi-bin/pywiki?KnowledgeMapping
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MappingSourceCodeWithWiki
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KnowledgeMapsWhitePaper ''Summary of Collaborative Knowledge Mapping in Business Information Management''
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See also MindMap, MentalModel
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CategoryKnowledge CategoryInformation