T4 or T-4 may refer to:

Airports and airlines

Heathrow Terminal 4 Heathrow Terminal 4 is an airport terminal An airport terminal is a building at an airport where passengers transfer between ground transportation and the facilities that allow them to board and disembark from an aircraft. Within the ter ...

Tiyas Military Airbase The Tiyas Military Airbase, also known as the T-4 Air base, is a Syrian Arab Air Force (SyAAF) base located in the Homs Governorate, north of Tiyas, and west of the ancient city of Palmyra, Syria. The Tiyas Military Airbase is the largest airbas ...

, also known as the T-4 Airbase

Biology and medicine

T4 phage Escherichia virus T4 is a species of bacteriophages that infect ''Escherichia coli'' bacteria. It is a double-stranded DNA virus in the subfamily ''Tevenvirinae'' from the family Myoviridae. T4 is capable of undergoing only a lytic lifecycle ...

, a bacteriophage *

Thyroxine File:Thyroid_system.svg, upright=1.5, The thyroid system of the thyroid hormones T3 and T4 rect 376 268 820 433 Thyroid-stimulating hormone rect 411 200 849 266 Thyrotropin-releasing hormone rect 297 168 502 200 Hypothalamus rect 66 216 386 25 ...

(T₄), a form of thyroid hormone * the T4 spinal nerve * the fourth thoracic vertebrae of the

vertebral column The vertebral column, also known as the backbone or spine, is part of the axial skeleton. The vertebral column is the defining characteristic of a vertebrate in which the notochord (a flexible rod of uniform composition) found in all chordate ...

* A non-small cell lung carcinoma staging for a type of tumour * A CD4 + T lymphocyte * T4: an EEG electrode site according to the 10-20 system

Entertainment

* ''T4'' (Channel 4), the former daytime teen-aimed slot on Channel 4 in the UK * ''

Terminator Salvation ''Terminator Salvation'' is a 2009 American military science fiction action film directed by McG and written by John Brancato and Michael Ferris. It is the fourth installment of the ''Terminator'' franchise and serves as a sequel to '' Termi ...

'', sometimes referred to as ''Terminator 4'' * '' Transformers: Age of Extinction'', the fourth film in the live-action ''Transformers'' film series

Computing

SPARC T4 The SPARC T4 is a SPARC multicore microprocessor introduced in 2011 by Oracle Corporation. The processor is designed to offer high multithreaded performance (8 threads per core, with 8 cores per chip), as well as high single threaded performan ...

, a microprocessor introduced by Oracle Microelectronics in 2011

Software and video games

Text Template Transformation Toolkit Text Template Transformation Toolkit (usually referred to as "T4") is a free and open-source template-based text generation framework. T4 source files are usually denoted by the file extension ".tt". Overview T4 is used by developers as part of ...

, a technology developed by Microsoft * ''

Tekken 4 is a fighting video game developed and published by Namco as the fourth main and fifth installment in the ''Tekken'' series, following the release of the non-canon crossover titled '' Tekken Tag Tournament'' in 1999. It was released as an arcade ...

'', a fighting game

Electricity production

* Lockheed Martin's High beta fusion reactor prototype, called T4

Rail transport

Eastern Suburbs & Illawarra Line The Eastern Suburbs & Illawarra Line (numbered T4, coloured azure blue) is a commuter railway line in the eastern and southern suburbs of Sydney and is a part of the Sydney Trains network. The line was constructed in the 1880s to Wollongong to ...

, a Sydney Trains railway service *

Île-de-France tramway Line 4 Île-de-France tramway Line 4, also called the T4, is an long tram-train line operated by the SNCF. It was inaugurated 20 November 2006, and runs between Aulnay-sous-Bois, Bondy and Montfermeil in the Seine-Saint-Denis department of Île-de-Franc ...

T4 (Istanbul Tram) T4 Topkapı - Mescid-i Selam tram line ( tr, T4 Topkapı - Mescid-i Selam tramvay hattı) is a light rail line in Istanbul, Turkey, operated by ''Istanbul Ulaşım AŞ''. It runs from Topkapı north to Mescid-i Selam, a total of . The T4 line op ...

Roads

Great East Road The Great East Road is a major road in Zambia and the main route linking its Eastern Province with the rest of the country. It is also the major link between Zambia and Malawi and between Zambia and northern Mozambique.Terracarta: ''Zambia, 2nd ...

, a road in Zambia

Vehicles

* Dayton-Wright T-4, a 1918 American light, single-seat reconnaissance aircraft *

Kawasaki T-4 The Kawasaki T-4 is a Japanese subsonic intermediate jet trainer aircraft developed and manufactured by the commercial conglomerate Kawasaki Heavy Industries. Its sole operator is the Japan Air Self-Defense Force (JASDF), in part due to historic ...

, a Japanese aircraft *

Soyuz T-4 Soyuz T-4 was a Soviet space mission which launched the crew of Salyut 6 EO-6, the sixth and final long-duration crew of the Salyut 6 space station. It was launched on 12 March 1981 and docked with the station the next day. During their stay, the ...

, a spatial mission *

Sukhoi T-4 The Sukhoi T-4, or "Aircraft 100", or "Project 100", or "Sotka" was a Soviet high-speed reconnaissance, anti-ship and strategic bomber aircraft that did not proceed beyond the prototype stage. It is sometimes called the Su-100. Design and devel ...

, a Soviet aircraft *

Tatra T4 T4 is the name of a tram produced by ČKD Tatra. It is the narrower variant of the Tatra T3 model. A large number of cars was supplied to the GDR, the USSR, Romania and the former Yugoslavia using names T4D, T4SU, T4R and T4YU, respectively. Th ...

, a 1967 Czechoslovakian tram *

Thaden T-4 __NOTOC__ The Thaden T-4 Argonaut was a 1930s American four-seat all-metal cabin monoplane built by the Thaden Metal Aircraft Company of San Francisco, California. Design and development The T-4 was the third and last design of the Thaden Metal ...

, a 1930s American four-seat all-metal cabin monoplane * Volkswagen Transporter series IV van * a model of the

OS T1000 T1000 and T1300 were two rapid transit train classes used on Oslo Metro in Oslo, Norway. The 197 cars were built by Strømmens Verksted, Norsk Elektrisk & Brown Boveri and AEG between 1960 and 1981. They were the first metro trains used in Oslo ...

train of the Oslo Metro * Model T4 Cunningham experimental armored car, later the M1 Armored car

Weapons and explosives

T-4 Atomic Demolition Munition The T4 Atomic Demolition Munition (ADM) was a nuclear weapon derived from the American W9 nuclear artillery shell. History The T4 was produced in 1957 from recycled W9 fissile components and was in service until 1963, when it was replaced with W ...

, a small tactical nuclear bomb * G7e/T4, a Falke German torpedo * The Italian name for the high explosive

RDX RDX (abbreviation of "Research Department eXplosive") or hexogen, among other names, is an organic compound with the formula (O2N2CH2)3. It is a white solid without smell or taste, widely used as an explosive. Chemically, it is classified as a ...

Other uses

* A T4 slip, a tax return form used in

income taxes in Canada Income taxes in Canada constitute the majority of the annual revenues of the Government of Canada, and of the governments of the Provinces of Canada. In the fiscal year ending 31 March 2018, the federal government collected just over three times m ...

* ''

Aktion T4 (German, ) was a campaign of mass murder by involuntary euthanasia in Nazi Germany. The term was first used in post- war trials against doctors who had been involved in the killings. The name T4 is an abbreviation of 4, a street address o ...

'', Nazi Germany's mass-murder of the mentally and physically disabled *

Normal space In topology and related branches of mathematics, a normal space is a topological space ''X'' that satisfies Axiom T4: every two disjoint closed sets of ''X'' have disjoint open neighborhoods. A normal Hausdorff space is also called a T4 space. T ...

in topology *

Paris Tramway Line 4 Paris () is the capital and most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the 30th most densely populated city in the world in 2020. Si ...

* Version 4 of ''Traveller'' role-playing game * T4, one of several fluorescent-lamp formats * A tornado intensity rating on the

TORRO scale The TORRO tornado intensity scale (or T-Scale) is a scale measuring tornado intensity between T0 and T11. It was proposed by Terence Meaden of the Tornado and Storm Research Organisation (TORRO), a meteorological organisation in the United Kingdo ...