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U 81 denotes:
-
SM U 81 , a submarine of the German Imperial Navy during the First World War
-
U 81 (Kriegsmarine) , a submarine of the German Wehrmacht in World War II
- the planned line U81 of the Düsseldorf Stadtbahn; see Düsseldorf tram
This is a
disambiguation page for differentiating between several terms identified with the same word.