You are probably thinking of the Moebius strip.
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a circle ??
square
A three-sided shape with one curved side is known as a "curvilinear triangle." This shape consists of two straight sides and one curved side, creating a triangle-like form with a rounded edge. It can be used in various mathematical and design contexts, where a blend of linear and curved geometry is required.
A figure that has a curved face or curved edge.
A cone perhaps?