"Exoskeleton" refers to an external skeleton or carapace that protects the sensitive flesh of a living creature. In robotic science and science fiction, an exoskeleton often refers to a form of mechanized suit or powered armour worn by humans. These exoskeletons (or "mech-suits" as they can be known) are highly popular in various forms of sci-fi media, particularly comics and anime. Prime examples of mech-suits include Marvel Comics' Iron Man, the Knight Sabers from the Japanese cyberpunk series Bubblegum Crisis, and many others.