Exo skeleton is incorrectly written, and should be written as "Exoskeleton" being its meaning:
The correct term is exoskeleton. Used in biology especially. It means the living organism does not have their skeleton internally, overlying tissue that has externally by way of shell. This usually occurs in arthropods and insects. Many must have seedlings or Ecdysis to improve its strength. In slang military exoskeleton is a special additional protective suits to be used at times of high confrontation.
