Whilst disassembling the old couch to become firefood,
under the fabric in
the bottom of the couch, I found an APL "quick reference" card! It's the
size of a playing card, and made of the same material of some really high
end card decks made 25-30 years ago[3]. It's called an "APL Vadis Enum" or
something -- it's Latin, of which I don't speak, and the card's at home,
'Vade mecum'? Roughly that means 'go with me' -- i.e. a handbook or card
or whatever you carry around with you.
Sounds like a good find anyway.
-tony