That's what those are!
We were waiting in line at the drugstore, and I was looking at the odd selection of DVDs and CDs under the counter.  Then I saw something and realized what it was. 
It's quite possible that today is the first day I realized what those three glyphs are, on the cover of the Police's Ghost in the Machine album.
Seriously. For years, nay, decades, I thought they were abstract retrotechnokanji. I can be so blind.
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