U 1
U1 or U 1 stands for:
- a child check-up, see child check-up # The individual examinations
- a symbol in physics to designate the voltage of the first of three phases in three-phase alternating current
- U1 TV, a private television broadcaster in Switzerland, see Switzerland 5
- Umlage U1 , an employer insurance in Germany
- Cover page 1 (front) for ad bookings in print publications, see pagination # covers
- Caspar U 1 , a seaplane from the Caspar-Werke for the use of submarines
- Udet U 1 , German aircraft from Udet Flugzeugbau
- Basement 1 , is located directly below a ground floor or 1st floor
U1 denotes the following underground lines:
- Underground line 1 (Berlin)
- Underground line A (Frankfurt am Main)
- Underground line 1 (Hamburg)
- Main line 2 (Munich subway) # U1
- U-Bahn Nürnberg # Route of the U1
- Subway line 1 (Vienna)
U-1 stands for:
- Duks U-1 , a trainer aircraft produced and used by the USSR in the 1920s
- Universal U-1, a Soviet tractor, see Universal (tractor)
U 1 is the name of the following submarines:
- U 1 (ship, 1906) (1906–1918), a submarine of the German Imperial Navy
- SM U 1 (1911-1919), a submarine of the Austro-Hungarian Navy
- U 1 (ship, 1935) (1935–1940), a submarine of the German Navy
- ORP Dzik (P52) #HDMS U-1 (1947–1950), a submarine of the Danish Navy
- U 1 (1961) (1962–1966), a submarine of the German Navy
- U 1 (1967) (1967–1991), a submarine of the German Navy
- U-001 Zaporizhia (U-Boot) (Ukrainian: U-001 Запоріжжя), Ukrainian submarine, formerly Soviet B-435
U (1) stands for:
- the unitary group over the complex numbers in mathematics
