I'm looking through the Calibre code on GitHub (which is mostly pointless since I understand nothing about it), and after thrashing wildly I see:
resources/viewer/mathjax/jax/element/mml/optable/GeometricShapes.js
Showing the top match. Last indexed on May 30.
47 '\u25C4': MO.BIN4, // black left-pointing pointer
That's most likely random noise on my part. But, it's interesting that it talks about a black left-pointing pointer. Of course, it's sitting in a mathjax resource of some kind. So, I can't see how it would be relevant.
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