U 9

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U9 stands for:

a child screening examination

U9 denotes the following underground lines:

U 9 is the name of the following submarines:

SM U 9 (1910–1919), a submarine of the German Imperial Navy
U 9 (Kriegsmarine) (1935–1946), a submarine of the German Kriegsmarine
U 9 (Bundeswehr) (1967–1993), a submarine of the German Navy