I’m talking about the far right wall of the building in [this](https://www.psindustries.com/wp-content/uploads/2020/08/DJI_0288-scaled.jpg) picture.
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Those are pre-stressed concrete panels. Ther look like two T’s with their tops connected. The top panel holds up the roof of the building, and the “fins” as you call them stiffen the panel to they don’t crack or buckle.
A thin wall is not structural as strong as a thicker wall in regards to a lateral load, ie a force parallel to the ground. A material efficient way to make an wall stong for a load like that is not to just make a thicker wall but to make part of it thicker.
You can compare it to a truss. What primary contributor to the strenght, in regards to bending, is how far away the outer edges are, the material in the middle has very little effect. This is why a truss is mostly air.
Take some cardboards ad compared how a flat sheet is to bend compared to if you tape some together so the cross-section is like a T.
If you are talking about the side wall of the building, it’s just corrugated. That wavey construction is stronger than a simple flat wall. Flat bottom boats and metal car port covers will also be corrugated since it increases the strength of the metal. Even cardboard boxes are corrugated between the flat outer layers that we see.
Hopefully a Reddit member who’s an engineer will see your post and explain it better than I can.
That fin structure allows the wall to be stronger while using less concrete. You could get an equally strong wall if you just made it a lot thicker concrete, but you can get the same strength with less material (and less cost) by structuring the wall in this way.
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