The concept of hierarchy, originally meaning "rule by priests", has been used metaphorically to describe many different things. See Hierarchy for the main article, and also: For the various types of hierarchy, see hierarchy (disambiguation) A hierarchy (in Greek: Ιεραρχία, it is derived from ιερός-hieros, sacred, and άρχω-arkho, rule) is a system of ranking and organizing things or people, where each element of the system (except for the top element) is subordinate to a single other element. ...

• Hierarchical organization
• Hierarchy (mathematics) (see also tree structure)
• Containment hierarchy
• Social hierarchy
• Hierarchy (object-oriented programming)
• Memory hierarchy

Please add other applicable articles to this list Hierarchy originally meant rule by priests, and it is from the organization of hierarchical churches such as the Roman Catholic and Eastern Orthodox churches, that the name of this concept arises. ... A tree structure is a way of representing the hierarchical nature of a structure in a graphical form. ... A hierarchy (in Greek hieros = sacred, arkho = rule) is a system of ranking and organizing things. ... This article needs a complete rewrite for the reasons listed on the talk page. ... In computer sciences object-oriented programming, the mapped relationships of sub- and superclasses is known as a hierarchy. ... The hierarchical arrangement of storage in current computer architectures is called the memory hierarchy. ...