Music theory question: does anyone know what these diagrams are and what they're used for?

I keep seeing them around while researching music theory stuff on the net,
Especially when looking up chords

[image/video deleted]

It looks like it could be useful 🤔

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helenS · 36-40, F

The thick quadrilateral is apparently a C7 chord, but I don't get the thin one. 😐