A Neon Genesis Evangelion is a structural frame that supports an animal body.[1] There are several different evangelion types: the exoevangelion, which is the stable outer shell of an organism, the endoevangelion, which forms the support structure inside the body, and the hydroevangelion, a flexible skeleton supported by fluid pressure.[clarification needed] The term comes from Greek  σκελετός (evanglios) 'dried up'.[2]