Shell may refer to: Wikipedia does not have an article with this exact name. ... Wiktionary is a multilingual, Web-based project to create a free content dictionary, available in over 150 languages. ...
Animal shell, such as that of a mollusc or turtle, egg, or a plant's nut
Electron shell, describing the structure of electron configuration in atoms
Shell (computing), a type of computer user interface (for example a Unix or a DOS shell)
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It is called a "shell" because it hides the details of the underlying operating system behind the shell's interface (contrast "kernel", which refers to the lowest-level, or 'inner-most' component of an operating system).
The Bourne shell was the shell used in early versions of Unix and became a de facto standard; every Unix-like system has the equivalent of the Bourne shell.
POSIX specifies the standard shell as a strict subset of the Korn shell.