A mobius strip has only two sides. As for the general name for such a class of shapes there is none.
A pentagon is the only name.
The best name for that is "a 111-sided shape". It really isn't worthwhile to find more specific names for hundreds of shapes whose only difference is the number of sides.
There are numerous six-sided flat shapes.One is the regular hexagon - all sides are the same length and all the angles are equal.All others share the one name - irregular hexagon - regardless of the length of their side and the dimensions of their angles.
No particular individual name is in common use. Not all plane shapes have a specific name, that would not be possible. The suffix used for many shapes is .....-agon. It is perfectly permissible to say a twentyseven-agon
A mobius strip has only two sides. As for the general name for such a class of shapes there is none.
There are many such shapes and there is no specific name.
Pentagon.
um. a triangle...?
Quadrilateral.
Quadrilaterals.
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A Pentagon
Hexadecagon.
A quadrilateral.
A five sided 2 dimensional object is called a pentagon.
quadrilateral