From Wikipedia [http://en.wikipedia.org/], the free encyclopedia:

PL/I ("Programming Language One", pronounced "pee el one") is a computer programming
language designed for scientific, engineering, and business applications.
It is undoubtedly one of the most powerful programming languages that has ever been created.
It has been used by various academic, commercial and industrial users since it was introduced
in the early 1960s, and in fact is still actively used today.

An extended version of PL/I, EPL, was the programming language for the implementation of [Multics].

Also known as [PL/1] (where the discussion on the topic also exists.)

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[Category Language]