Here’s a little help. I looked in the 1972 edition of Henry Dreyfuss’s definitive “Symbol Sourcebook” and could find no similar symbol. While he died shortly after it was published, in the preface he states,
“A Plea for More Symbols - One day a central archive surely will be established, in which all symbols used throughout the world will be catalogued and available for reference. Looking toward this goal, we are keeping our Data Bank active and open for further contributions…”
Michael Ellis?
I don’t think so 
It was just weird pronounciation of LS
That seems a little more recent than the 1997 sources cited in the article.
Just a guess, but it could mean ‘thinking outside of the box’.
Oh, and the true definition of fnords as well, I suppose? You know the consequences of revealing that tidbit.
the trippiest part of the schrodinger’s cat scenario is that there is no box
He defines it in one of the suppressed volumes of The Art of Computer Programming.
That is why the cat is both alive and dead! No box means no reason to live!!
We solved it!! 
This was covered by the OP. The guy found that information. The problem is it remains unknown who or why it was added to the ISOAMSA set. When Unicode began, they seeded it by absorbing a big pile of other character standards from all manner of different fields. Each of those sets had various policies and administrators who weren’t all equally good at documenting and tracking every character.
In this case, the next step would be to get the administrators of ISOAMSA on the phone because they may have paper records, or digital ones not online, of where the symbol came from. The student who wrote the OP stopped here in his research.
I think this is a really good guess. If there’s another one with the arrow pointing the other way, it could indicate left-hand and right-hand coordinate systems.
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