mirror image

noun
1.
an image of an object, plan, person, etc., as it would appear if viewed in a mirror, with right and left reversed.
2.
an object having a spatial arrangement that corresponds to that of another object except that the right-to-left sense on one object corresponds to the left-to-right sense on the other.

Origin:
1880–85

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mirror image
 
n
1.  an image as observed in a mirror
2.  an object that corresponds to another object in the same way as it would correspond to its image in a mirror

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
As you note, his left hand is raised to appear as an oath in the mirror image.
The images formed by the mirror image are a reflection of relationship between
  people on stage.
So this is sort of the mirror image of offering tax credits to companies when
  they hire.
The long day closed, in other words, on a mirror image of its beginning.
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