Centre of Inversion on Twofold Axis (2 / m)


The symbol above shows a twofold axis perpendicular to the plane of the screen, i.e parallel to Z, with a centre of inversion on the axis. This combination results when there is a mirror plane perpendicular to the twofold axis, hence the written symbol "2 / m". A fractional value next to the symbol indicates the height of the inversion centre above the XY plane.

© Copyright 1995-2006.  Birkbeck College, University of London. Author(s): Jeremy Karl Cockcroft