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

Science and technology

U4 spliceosomal RNA The U4 small nuclear Ribo-Nucleic Acid (U4 snRNA) is a non-coding RNA component of the major or U2-dependent spliceosome – a eukaryotic molecular machine involved in the splicing of pre-messenger RNA (pre-mRNA). It forms a duplex with U6, an ...

, 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

* U-Bahn lines ** U4 (Berlin U-Bahn) ** U4 (Frankfurt U-Bahn) ** U4 (Hamburg U-Bahn) ** U4 (Munich U-Bahn) ** U4 (Vienna U-Bahn) * German submarine U-4, 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

Organizations

* U4, the former name of the Maple League of Universities * Anti-Corruption Resource Centre, based at the Chr. Michelsen Institute in Bergen, Norway

Other uses

* U4, an Unemployment#United States Bureau of Labor statistics, unemployment figure released by the United States Bureau of Labor Statistics * ''Ultima IV: Quest of the Avatar'', a video game

Science and technology

Transport

Organizations

Other uses

See also