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Based on your description, it sounds like you might be referring to the shape of a "right triangle with a curved hypotenuse."
This shape has a right angle on the bottom left corner, a triangular shape at the top, and a curved side connecting the other two corners. The curved side is known as the hypotenuse and is opposite to the right angle.
Here's a rough sketch of what it might look like:
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I hope this helps!
