T4 or T-4 may refer to:

Airports and airlines

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 (T₄), a form of thyroid hormone * the T4

spinal nerve A spinal nerve is a mixed nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body. In the human body there are 31 pairs of spinal nerves, one on each side of the vertebral column. These are grouped into th ...

* the fourth thoracic vertebrae of the vertebral column * A

non-small cell lung carcinoma staging Non-small-cell lung cancer (NSCLC) is any type of epithelial lung cancer other than small-cell lung carcinoma (SCLC). NSCLC accounts for about 85% of all lung cancers. As a class, NSCLCs are relatively insensitive to chemotherapy, compared to sm ...

for a type of tumour * A

CD4 In molecular biology, CD4 (cluster of differentiation 4) is a glycoprotein that serves as a co-receptor for the T-cell receptor (TCR). CD4 is found on the surface of immune cells such as T helper cells, monocytes, macrophages, and dendritic ...

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

Computing

* SPARC T4, 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'', a fighting game

Electricity production

* Lockheed Martin's

High beta fusion reactor The Lockheed Martin Compact Fusion Reactor (CFR) is a fusion power project at Lockheed Martin’s Skunk Works. Its high-beta configuration, which implies that the ratio of plasma pressure to magnetic pressure is greater than or equal to 1 (compare ...

prototype, called T4

Rail transport

* Eastern Suburbs & Illawarra Line, a Sydney Trains railway service * Île-de-France tramway Line 4 * T4 (Istanbul Tram)

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 __NOTOC__ The Dayton-Wright T-4 Messenger was a light, single-seat reconnaissance aircraft built in the United States by the Dayton-Wright Company in 1918 in the hope of gaining a production contract from the United States Army. It was a small con ...

, a 1918 American light, single-seat reconnaissance aircraft * Kawasaki T-4, a Japanese aircraft * Soyuz T-4, a spatial mission * Sukhoi T-4, 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. The ...

, a 1967 Czechoslovakian tram * Thaden T-4, a 1930s American four-seat all-metal cabin monoplane * Volkswagen Transporter series IV van * a model of the OS T1000 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 W3 ...

, 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 n ...

Other uses

* A T4 slip, a tax return form used in income taxes in Canada * '' Aktion T4'', Nazi Germany's mass-murder of the mentally and physically disabled * Normal space 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. Sin ...

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