Re: Dave\'s not here, man!
Probably the best acronym that I can remember was on the 727 flight engineer panel.
The switch was part of the air conditioning system marked "Aft Cabin Heat" or something like that.
Above the switch, scribbled in pen, it was marked "DFW".
The feature of the system was so hard to understand, and if you used it poorly, you can easily 'smoke a pack' so previous second officers marked it "DFW" as in "Don't (blank) With"