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Originated from the Lisp “s-expression” (for an expression in Lisp), `sexp` in Emacs refers to an expression in any language your program is written in.

Originated from the Lisp “s-expression” (for an expression in Lisp), sexp in Emacs refers to an expression in any language your program is written in.

Source: https://www.emacswiki.org/emacs/Sexp