A TRICORN. That this 'three corners'. These type of hats were often worn by historical characters.
There is also a 'BICORN' hat. Again often worn by historical characters. The points/corners of the hat being over the forehead and over the back of the neck.
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It will look like a cone-shaped party hat from the side and a bullseye from the top.
A pyramid is triangular shaped.
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a tent? a block of cheese?