S-Expressions
The basic syntax of the programming language Lisp. Short for symbolic expression. Often abbreviated as sexp.
(en.wikipedia.org) S-expression - Wikipedia website
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In computer programming, an S-expression (or symbolic expression, abbreviated as sexpr or sexp) is an expression in a like-named notation for nested list (tree-structured) data. S-expressions were invented for, and popularized by, the programming language Lisp, which uses them for source code as well as data.