I believe your are talking about a 3D figure called a Mobius strip. It is a strip of paper that has a half-turn in it that causes technically a one sided figure.
A piece of wire twisted to form a circle is commonly referred to as a wire loop or wire ring. This simple shape can be utilized in various applications, such as jewelry making, crafting, or as a component in mechanical assemblies. The twisted design can enhance its structural integrity and aesthetic appeal, depending on the thickness and type of wire used.
A 3D semi circle
a sphere?
circumference
A piece of an edge of a circle is called an ARC.
A twisted pantyhoe.
We call it a "semi-circle"
twirled, spin, move in a circle.
A semi-circle
Concentric Circles?
We call it a circle.
The Twisted blade that helps a plane fly and a ship move is call a propeller.
A circle with three dimensions is sphere.
square, circle, triangle, twisted triangle, pentagon, twisted pentagon, brick, wall, twist, corkscrew, quad, tornado, cobra, twisted cobra, butterfly, staircase, diamond braid, zipper, fishy pull, candy stripe
a semi circle? common sense
Inscribed
A quarter of a circle or a quadrant!