Viewed as a sequence of close-packed planes, this lattice corresponds to a stacking order of ABABAB, etc.
Viewed as a sequence of close-packed planes, this lattice corresponds to a stacking order of ABABAB, etc., so it has a comparatively high stacking fault.  Due to the poor geometric distribution of slip systems, crystals of this Bravais lattice type are generally more susceptible to deformation by twinning.  Titanium below 882?C ["degrees Celsius"], zirconium below 863?C, cadmium and berylium all have this crystal structure.  Crystals of this type are characterized using four Miller-Bravais indices, rather than three.  FTP, identify this non-rectangular lattice of best possible compactification.
Viewed as a sequence of close-packed planes, this lattice corresponds to a stacking order of ABABAB, etc.
hexagonal close-packed (or close-packed hexagonal; prompt on "hexagonal")