(Inspired by Reddit post of the last month)
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Looks like the sound holes of a violin to me.
Oh look, it’s a music major.
But they are not. Those are called f-holes.
F-holes are the name specifically for the holes in the violin family and the contrabass. The more general term is sound hole, which also includes the c-holes of the viol family or the large round hole of a guitar.
F-holes, in particular, are shaped pretty much exactly like an integration sign.