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nonsymmetric

British  
/ ˌnɒnsɪˈmɛtrɪk /

adjective

  1. logic maths (of a relation) not symmetric, asymmetric, or antisymmetric; holding between some pairs of arguments x and y and failing to hold for some other pairs when it holds between y and x

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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To achieve true optical isolation, the scattering matrix of the system must be nonsymmetric.

From Science Magazine