(1) (Locator/Identifier Separation Protocol) A proposal from Cisco for reducing the size of the constantly expanding routing tables in the Internet. Working in conjunction with the border gateway protocol (BGP), LISP-identified packets enter the core routers with the destination service provider's IP address, not that of the end user. The provider's edge routers remove the LISP data and deliver the packets to the end users.

(2) (LISt Processing) A high-level programming language used for developing AI applications. Developed in 1960 by John McCarthy, its syntax and structure is very different from traditional programming languages. For example, there is no syntactic difference between data and instructions.

LISP is available in both interpreter and compiler versions and can be modified and expanded by the programmer. Many varieties have been developed, including versions that perform calculations efficiently. The following Common LISP example converts Fahrenheit to Celsius:

   (defun convert ()
     (format t "Enter Fahrenheit ")
     (let ((fahr (read)))
      (format t "Celsius is <126>D"
        (truncate (*(-fahr 32)
            (/ 5 9))))))