Orientability
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In the Euclidean space R3 is called orientable if a two-dimensional figure (for example, 
) cannot be moved around the surface and back to where it started so that it looks like its own mirror image (
). Otherwise the surface is non-orientable. A concept connected to this is chirality. This means that no matter what, a human right hand, cannot be rotated in such a way that it becomes a human left hand. The right hand is therefore orientable.
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