This poster has two triangles, one is superimposed on Scarlett Johansson.
The second triangle in the logo.
What are the artists trying to show with these symbols?
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I was looking for the same last week after watching the movie when I found this on Reddit. This looks like the correct explanation and makes sense.
The triangle represents three components of the human psyche; Id, Ego, and Super Ego.
Here is the source Reddit discussion page.