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In the context of Multics it was generally spelled "PL/1" rather than "PL/I" (the latter being IBM usage); source files named xxx.pl1, compiled with the "pl1" command. See for instance https://www.multicians.org/pl1-raf.html

Took 'em a while to get to the "what does this thing look like?" part https://en.wikipedia.org/wiki/PL/I#Hello_world_program

Same, first CS class used PL/I though we used terminals not punch cards.

> it's rendered PL/I

Fixed.