S-expression
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S-expression(Q1113529) short for symbolic expression, abbreviated as sexpr or sexp, is a computable data serialization format. In programming practice, S-expression is often denoted in the Backus-Naur Form.
In computer programming, an S-expression 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.