An organisation with few things, or one thing, at the top and with several things below each other thing.

An inverted tree structure.

Examples in computing include a directory hierarchy where each directory may contain files or other directories; a hierarchical network (see hierarchical routing), a class hierarchy in object-oriented programming.

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Hierarchical Data Format
hierarchical file system
Hierarchical Music Specification Language
hierarchical navigation
hierarchical routing
anonymous FTP
backing store
Brian Reid
high bit
High bit-rate Digital Subscriber Line
high colour
high density
Higher Education National Software Archive