An asymmetry property important in several branches of science. An object or a system is called CHIRAL if it differs from its mirror image, and its mirror image cannot superimpose on the original object. A chiral object and its mirror image are called ENANTIOMORPHS (Greek opposite forms) or, when referring to molecules, enantiomers. A non-chiral object is called ACHIRAL (sometimes also AMPHICHIRAL) and can be superimposed on its mirror image. Used in the context of Busycon and the SINISTRAL and DEXTRAL forms.