The top level of a Lisp system has historically been called the read-eval-print loop. Most modern Lisps

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The top level of a Lisp system has historically been called the "read-eval-print loop."

Most modern Lisps print a prompt before reading input, so it should really be called the "prompt-read-eval-print loop," but there was no prompt in some early systems like MacLisp, so the shorter name stuck. If we left out the prompt, we could write a complete Lisp interpreter using just four symbols:

(loop ( p r i n t (eval ( r e a d ) ) ) )

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