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 spli ...

, 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 foun ...

, a human genetic group * U4,

unitary group Unitary may refer to: Mathematics * Unitary divisor * Unitary element * Unitary group * Unitary matrix * Unitary morphism * Unitary operator * Unitary transformation * Unitary representation * Unitarity (physics) * ''E''-unitary inverse semi ...

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 op ...

, a synthetic opioid * U04, the

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

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 that is the shortest in Berlin's U-Bahn system, with a length of . Opened in 1910, the U4 serves five stations, all of which are step-free: it is also the only subway line in Berlin to have never ...

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

** U4 (Hamburg U-Bahn) **

U4 (Munich U-Bahn) The Munich U-Bahn () is an Railway electrification system, electric rail Rapid transit, rapid transit network in Munich, Germany. The system began operation in 1971, and is operated by the municipally owned Münchner Verkehrsgesellschaft (MVG; Mun ...

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

* 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 Arriva London, Go-Ahead London ( ...

* 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 later a division of Ro ...

, 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 jet, business use. They were designed and built by Gulfstream Aerospace, a General Dynamics company based in Savannah, Georgia, ...

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 Prog ...

(former) IATA airline designator * U4,

Buddha Air Buddha Air Pvt. Ltd () is an airline based in Lalitpur, Nepal. It operates domestic flights within Nepal as well as international services to Varanasi, India, from its main base in Tribhuvan International Airport, Kathmandu.Flight International ...

current IATA airline designator

Other uses

* 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 eastern Canada. The four member schools, Acadia University, Bishop's University, Mount Allison University, and St. Francis Xavier University ...

* U4, an unemployment figure released by the United States Bureau of Labor Statistics * '' Ultima IV: Quest of the Avatar'', a video game * U4 Anti-Corruption Resource Centre en organisasjon under

Science and technology

Transport

Other uses

See also