Partial Orientation of Molecules in a Solid
This illustration shows a solid state where the orientation is only partial, as in the case of twin crystals. Here, the molecules of each horizontal row have two of their axes parallel with those above and below them, but not the third.
George Huntington Williams, Ph.D. Elements of Crystallography for Students of Chemistry, Physics, and Mineralogy (New York, NY: Henry Holt and Company, 1892)