U4

U4, U-4, or U04 may refer to:

Science and technology[edit]

U4 spliceosomal RNA, a non-coding RNA component of the major U2-dependent spliceosome
Haplogroup U4 (mtDNA), a human genetic group
U4, unitary group of degree 4
U-47700, a synthetic opioid
U04, the ICD-10 code for severe acute respiratory syndrome

Transport[edit]

U-Bahn lines
German submarine U-4, one of several German submarines
London Buses route U4
U-4, the U.S. Air Force version of the Aero Commander (aircraft), a light twin-engined aircraft from Aero Design and Engineering Company
U-4, the Japanese air self-defense force designation for the Gulfstream IV aircraft
U4, PMTair (former) IATA airline designator
U4, Buddha Air current IATA airline designator

Other uses[edit]

U4, the former name of the Maple League of Universities
U4, an unemployment figure released by the United States Bureau of Labor Statistics
Ultima IV: Quest of the Avatar, a video game

See also[edit]

4U (disambiguation)

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