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[[File:Binary tree structure.svg|300px|thumb|A tree structure showing the possible hierarchical organization of an encyclopedia]]
[[File:ENC SYSTEME FIGURE.jpeg|300px|thumb|The original [[Encyclopédie]] used a tree diagram to show the way in which its subjects were ordered.]]
A '''tree structure''' or '''tree diagram,''' '''tree model''' is a way of representing the [[hierarchy|hierarchical]] nature of a [[structure]] in a graphical form. It is named a "tree structure" because the classic [[#Representing trees|representation]] resembles a [[tree]], even though the chart is generally upside down compared to a biological tree, with the "stem" at the top and the "leaves" at the bottom.
A tree structure is conceptual, and appears in several forms. For a discussion of tree structures in specific fields, see [[Tree (data structure)]] for computer science: insofar as it relates to graph theory, see [[tree (graph theory)]], or also [[tree (set theory)]]. Other related articles are listed.
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