ZetaLisp

ZetaLisp is the Lisp dialect running on the MIT-derived Lisp machines, including CADR and machines from Symbolics, LMI, and TI. Originally it was called Lisp Machine Lisp, and it borrowed heavily from the earlier MacLisp dialect (as did EmacsLisp).

ZetaLisp is the hosting language for several Emacs implementations: