this mental floss lists the classic (upside down) SHELL.OIL which was a good punchline during the oil embargo, you make people type in a calculation about gas prices, and then say "who wins?" and have them flip the calculator over
The calculation I was introduced to had some narrative that resulted in the display showing: SELL.ShELLOIL. Stock advice was somewhat lost on 8-year-old me, but I was amused nevertheless, as the fluorescent green segment display pulsed.
I also learned the other one, referenced downthread, but for me it was "BOOBLESS".
My father's calculator was one of the coolest bits of kit that he actually let me touch and use fairly often. I can't remember if it was a TI or what brand, but it definitely had that really legible blue-green display, and removable batteries, I guess AAs or a 9V, and it had a soft black carrying case where we carefully and reverently returned it whenever we were finished calculating. Of course it was hardly scientific and only had the four basic functions. I don't remember, pun not intended, whether it had a memory function or not.
https://www.mentalfloss.com/article/12512/calculator-words
i myself invented blinking I.DIG BIG.BOOBS by 1975 at least with my HP-25, if nobody has an earlier citation.
the wayback machine archive of the calculator words website that article references
http://web.archive.org/web/20070622095250/http://www.langmak...