A structural (i.e., neural) asymmetry or a functional one expressed in behavior. In the latter case, it is performed in a consistent, but not inflexible, manner. The ongoing question is how structural asymmetries relate to functional asymmetries.
See Ambidexterity, Apraxia, Bimanual task, Hand preference, Handedness (bimanual vs unimanual), Lateral bias, Peg-moving task