Exoskeleton
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An exoskeleton is a type of skeleton that is an external anatomical feature that supports and protects an animal's body, in contrast to the internal endoskeleton of, for example, a human.
Humans have long used armour as an artificial exoskeleton for protection, especially in combat. Exoskeletal machines are also starting to be used for medical and industrial purposes, while powered human exoskeletons are a feature of science fiction writing, but are currently moving into prototype stage. Orthoses are a limited, medical form of exoskeleton.
A powered exoskeleton is a powered mobile machine consisting primarily of a skeleton-like framework worn by a person, and a power supply which supplies at least part of the activation-energy for limb movement.
Powered exoskeletons are designed to assist and protect the wearer. They may be designed for example to assist and protect soldiers and construction workers, or to aid the survival of people in other dangerous environments.