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The word homoiconic can be understood by inspecting its roots: homo, meaning "the same" and icon, meaning "represent...
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S expression in Lisp may be program, input data, output data, database, query language, ...
In case web communication in:
HTML -> Lisp
CSS -> Lisp
JS -> Lisp
...
Lisp is a simplest language for transfer, store and manipulate information.