Crescents. The definition of a crescent is: two lines the connect at end points, and crescents don't nessicarly mean they have to be shaped like the crescent moon. If drawn correctly, they can be semetrical.
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The proper mathematical object is the complex projective space CP1 quotiented out by the group action of Z mod 2 i.e. (CP^1)/(Zmod2)=CP^1/(+-1)
Taking the Riemann Sphere, we identify antipodal points.