FIGURE 2. All forms of ferroic order under the parity operations of space and time.
From the following article:
Observation of ferrotoroidic domains
Bas B. Van Aken, Jean-Pierre Rivera, Hans Schmid & Manfred Fiebig
Nature 449, 702-705(11 October 2007)
doi:10.1038/nature06139
For the toroidic moment, spins replace the current loops of Fig. 1.
