Exoskeleton

An exoskeleton is a hard, supportive and/or protective structure that occurs in the external anatomy of many organisms. Most commonly found in invertebrates, such as insects and other arthropods, exoskeletons are also found on some sentient lifeforms.

Tholians possessed exoskeletons composed primarily of minerals, and were susceptible to cracking or even shattering at temperatures that were lower than their natural tolerances. 

Rasiinians feature a bony exoskeletal plate that covers their faces.

Klingons have an exoskeleton that encases their cranium. This protective structure has a feature called the tricipital lobe. 

Borg drones are fitted with artificial exoskeletons known as exo-plating. This protective layer is sometimes installed directly over the clothing and equipment that the drone had been wearing when it was assimilated. The Borg exoskeleton in Seven of Nine's arm was capable of withstanding five million gigawatts of power. 

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Exoskelett