an image of an object, plan, person, etc., as it would appear if viewed in a mirror, with right and left reversed.

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.

noun

carbon copy , copy , dead ringer , doppelganger , eidetic image , exact duplicate , facsimile , living image , living picture , lookalike , lookalikes , spit and image , spitting image , very image