Meaning of non-orientable in English:

non-orientable

Pronunciation /ˌnɒnɔːrɪˈɛntəbl/ /ˌnɒnɒrɪˈɛntəbl/

adjective

Mathematics
  • Of a manifold: not having a well-defined global coordinate system; not orientable; specifically (of a surface) such that a figure in the surface can be continuously transformed into its mirror image by taking it round a closed path in the surface.

Origin

1920s; earliest use found in Transactions of the American Mathematical Society. From non- + orientable.