U 1

U1 stands for:

• A child checkup
• An icon in the physics to describe the voltage of the first of three phases in the three-phase AC
• U1 TV, a private television station in Switzerland
• Apportionment U1, an employer insurance in Germany
• Cover page 1 (front) with display bookings in print publications, see also pagination

U1 means the following subway lines:

• Metro Line 1 (Berlin)
• Metro Line 1 (Frankfurt)
• Metro Line 1 (Hamburg)
• Metro Line 1 (Munich )
• Metro Line 1 (Nuremberg)
• Metro Line 1 (Vienna)

U-1 stands for:

• Duk U-1, one in the 1920s produced and employed by the USSR trainer aircraft

U 1 is the name of U- boats:

• U 1 (ship, 1906) ( 1906-1918 ), a submarine of the German Imperial Navy
• U 1 ( kuk Marine) ( 1911-1919 ), a submarine of the Austria -Hungarian Navy
• U 1 (ship, 1935) ( 1935-1940 ), a submarine of the German Navy
• HDMS U 1 (1947-1950), a submarine of the Danish Navy
• U 1 (Bundeswehr) ( 1962-1991 ), a submarine of the German Navy

U (1) stands for:

• The unitary group over the complex numbers in mathematics

• Disambiguation
• Abbreviation