I’m guessing the person who implemented it got this exact requirement wording in the Unicode definition and nothing else, didn’t make the logical connection, and just implemented it as close to literally as they could.
> I had no idea what it meant or was used for, thus assigned it a “descriptive name” when collating the symbols for the STIX project.
If I understand this correctly in the context, this person named the glyph based on what it looked like. So it wasn't the other way around.
⍼ (U+237C) is in Unicode 3.2 (from 2002), (U+1F4C9) is from Unicode 6.0 (from 2010).
[edit]: HN ate my 1F4C9 glyph. Use your imagination :)
Or a lightning bolt through a window (with only the bottom-left of the window frame being visible).