A dialect of Lisp developed at MIT AI Lab in 1966, known

for its efficiency and programming facilities. Later used by

Project MAC, Mathlab and Macsyma. Ran on the PDP-10.

Introduced the LEXPR (a function with variable arity),

macros, arrays, and CATCH/THROW. Was once one of two

main branches of LISP (the other being Interlisp). In 1981

Common LISP was begun in an effort to combine the best

features of both.