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) Haplogroup U is a human mitochondrial DNA haplogroup (mtDNA). The clade arose from haplogroup R, likely during the early Upper Paleolithic. Its various subclades (labelled U1–U9, diverging over the course of the Upper Paleolithic) are found ...

, a human genetic group * U4,

unitary group In mathematics, the unitary group of degree ''n'', denoted U(''n''), is the group of unitary matrices, with the group operation of matrix multiplication. The unitary group is a subgroup of the general linear group . Hyperorthogonal group is an ...

of degree 4 *

U-47700 U-47700, also known as U4, pink heroin, pinky, and pink, is an opioid analgesic drug developed by a team at Upjohn in the 1970s which has around 7.5 times the potency of morphine in animal models. U-47700 is a structural isomer of the earlier o ...

, a synthetic opioid * U04, the

ICD-10 ICD-10 is the 10th revision of the International Statistical Classification of Diseases and Related Health Problems (ICD), a medical classification list by the World Health Organization (WHO). It contains codes for diseases, signs and symptoms, ...

code for severe acute respiratory syndrome

Transport

* U-Bahn lines **

U4 (Berlin U-Bahn) The U4 is a line of the Berlin U-Bahn in Germany, the shortest in Berlin's U-Bahn system with a length of . It serves five stations, with only the two termini being step-free. Opened in 1910, it is the only subway line in Berlin to have never be ...

U4 (Frankfurt U-Bahn) The U-Bahn Line B is the second line in the network of the Frankfurt U-Bahn. It leads in west–east direction from the central railway station (''Hauptbahnhof'') over the old town to Konstablerwache, where it splits into two branches to Bornheim ...

U4 (Hamburg U-Bahn) The U4 is a line of the Hamburg U-Bahn, which opened in 2012, serving 12 stations. It is the shortest line of the network, with a length of and from Jungfernstieg to Billstedt it shares tracks with the U2. Route The U4 is the newest line of the ...

U4 (Munich U-Bahn) The Munich U-Bahn (german: U-Bahn München) is an electric rail rapid transit network in Munich, Germany. The system began operation in 1971, and is operated by the municipally owned Münchner Verkehrsgesellschaft (MVG; Munich Transport Company) ...

U4 (Vienna U-Bahn) Line U4 is a line on the Vienna U-Bahn metro Metro, short for metropolitan, may refer to: Geography * Metro (city), a city in Indonesia * A metropolitan area, the populated region including and surrounding an urban center Public transpo ...

* German submarine ''U-4'', one of several German submarines *

London Buses route U4 This is a list of Transport for London (TfL) contracted bus routes in London, England, as well as commercial services that enter the Greater London area (except coaches). Bus services in London are operated by Abellio London, Arriva London, G ...

* U-4, the U.S. Air Force version of the

Aero Commander (aircraft) The Aero Commander 500 family is a series of light-twin piston-engined and turboprop aircraft originally built by the Aero Design and Engineering Company in the late 1940s, renamed the Aero Commander company in 1950, and a division of Rockwell ...

, a light twin-engined aircraft from Aero Design and Engineering Company * U-4, the Japanese air self-defense force designation for the

Gulfstream IV The Gulfstream IV (or G-IV or GIV) and derivatives are a family of twinjet aircraft, mainly for private or business use. They were designed and built by Gulfstream Aerospace, a General Dynamics company based in Savannah, Georgia, United States, ...

aircraft * U4,

PMTair PMTair (Progress MulTi Air) was a Cambodian airline offering regularly scheduled domestic and international passenger and cargo services out of Phnom Penh International Airport. History PMTair was founded on 14 January 2003 and was owned by Progr ...

(former) IATA airline designator * U4,

Buddha Air Buddha Air Pvt. Ltd ( ne, बुद्ध एयर) is an airline based in Jawalakhel, Lalitpur, Nepal, near Patan. It operates domestic as well as international services within Nepal and India, serving mainly large towns and cities in Nep ...

current IATA airline designator

Organizations

* U4, the former name of the

Maple League of Universities The Maple League of Universities, previously known as the U4, is an association of four universities in Canada. The four member institutions, Acadia University, Bishop's University, Mount Allison University, and St. Francis Xavier University, a ...

Anti-Corruption Resource Centre Anti-corruption (or anticorruption) comprises activities that oppose or inhibit corruption. Just as corruption takes many forms, anti-corruption efforts vary in scope and in strategy. A general distinction between preventive and reactive measu ...

, based at the Chr. Michelsen Institute in Bergen, Norway

Other uses

* U4, an 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