Rozen Maiden (Rosen Maiden) is the name of the doomed Medical Corps airship on which The Unstoppable Higgs is serving when he achieves [ distinction] [[Chronology - Volume #|✣ ]]. Although the name of the ship is never mentioned in the dialog, the letters "ROZEN MAIDEN" can be clearly seen on Higgs' hat in [ panel 1] [[Chronology - Volume #|✣ ]] here and in [ panel 4] [[Chronology - Volume #|✣ ]] here. [ Panel 6] [[Chronology - Volume #|✣ ]] here demonstrates that the first word in the name is not "frozen", as had been previously suspected. In the same page, it can be seen that the Professors themselves haven't agreed on a spelling, as it spelled both 'Rozen' and 'Rosen.'