 An object or a system is "chiral" if it is distinguishable from its mirror image; that is, it cannot be superimposed onto it.Conversely, a mirror image of an "achiral" object, such as a sphere, cannot be distinguished from the object.A chiral object and its mirror image are called "enantiomorphs" (Greek, "opposite forms") or, when referring to molecules, "enantiomers".