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They are mathematical oddities such as the Mobius strip.
It's called a mobius strip.
A mobius strip has only two sides. As for the general name for such a class of shapes there is none.
I guess you could say that a Mobius strip is a one-sided shape. Or a circle, because there are no corners or divisions where another side starts.
A line (2D), ray (2D), vector (2D), line segment (2D), a mobius strip (3D), or a klein bottle (3D).