IMP - Programming language

IMP is a programming language created in 1968 by Edgar T. Irons.

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IMP is an early systems programming language that was developed by Edgar T. Irons in the late 1960s through early 1970s. Unlike most other systems programming languages, IMP was an extensible syntax programming language. Read more on Wikipedia...

IMP Wikipedia page
IMP first developed in National Security Agency
See also: (2 related languages)Edinburgh IMP, Algol

Example from Wikipedia:

<ATOM> ::= ABS ( <ATOM,A> ) ::= DEWOP(214B,AREG1(1,13),A)