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They believed the reason trigonal chloride electrolytes can achieve low ionic conductivity is based on the variation of metal ion arrangements within the structure.

Tiny quartz crystals, for instance, increase in volume as they undergo a transition from a trigonal to hexagonal shape.

Bill short, strong, conic, base trigonal, sides compressed, culmin elevated, upper mandible towards the tip deflexed and notched, under mandible shorter and straight, the base thick, the margins of both inflexed.

Anterior wings trigonal, the hinder dentated, generally tailed, with an obtuse concave lobe at their anal angle, which is generally in motion when the insect is at rest.

Bill short, very straight, base trigonal, beyond attenuated to a very fine point; upper mandible above rounded, both entire.