What does this symbol represent?

As pointed out in this blog post, the triangle/pyramid shape is a reoccurring symbol in Gretel & Hansel:

The second is an obvious allusion to the 'Eye of Providence', originally a Christian symbol, but nowadays more often invoking associations with Freemasonry (especially the eye within a pyramid shape).

Less obvious - but still referencing it - is the shape of the witch's outfit:

Apart from these signs alluding to alchemy and magic, I can think of a few other reasons they could have been used:

• To emphasize the symbolism or mysticism of the film('s plot), rather than it being a straightforward story - it is a fairy-tale, after all.
• As an allusion to the stereotypical witch's hat.
• Purely as branding, or visually tying parts of the film together.
• (Art-)historically, the triangle/pyramid shape is a sign of hierarchy. I haven't seen the film, and it seems unlikely this plays a role here, but it could imply the imminent overthrow of the witch or a constant power struggle.