Hauptmann is a German word usually translated as captain when it is used as an officer's rank in the German, Austrian and Swiss armies. While "haupt" in contemporary German means "main", it also has the meaning of "head", i.e. Hauptmann literally translates to "head man", which is also the etymological root of "captain" (from Latin caput head). It equates to Captain in the British and US Armies, and is rated OF-2 in NATO.