Lisp Machine Lisp
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A dialect of the Lisp programming language. Lisp Machine Lisp is a direct descendant of MacLisp, and was initially developed in the mid to late 1970s as the systems programming language for the MIT Lisp machines.
Lisp Machine Lisp itself branched into 3 dialects. Symbolics named their variant Zetalisp. Lisp Machines, Inc. and later Texas Instruments would share a common code base, but their dialect of Lisp Machine Lisp would differ from the version maintained at the MIT AI Lab by Richard Stallman and others.