In airports and airlines

• The IATA airline code for Hellas Jet
  Hellas Jet
  Hellas Jet was a charter airline based in Athens, Greece, operating services to Greece from destinations in Europe. Its main base was Athens International Airport. Hellas Jet was a licenced scheduled and charter carrier, holding a JAA AOC and a Line Maintenance Certificate under JAA/EASA Part 145,...
  
  
• Madrid Barajas Airport Terminal 4
• London Heathrow Airport Terminal 4

In biology and medicine

• T4 phage, a bacteriophage
• Thyroxine
  Thyroxine
  Thyroxine, or 3,5,3',5'-tetraiodothyronine , a form of thyroid hormones, is the major hormone secreted by the follicular cells of the thyroid gland.-Synthesis and regulation:...
  
   (T₄), a form of thyroid hormones
• The T4 spinal nerve
  Spinal nerve
  The term spinal nerve generally refers to a mixed spinal nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body...
  
  
• Fourth thoracic vertebrae of the vertebral column
  Vertebral column
  In human anatomy, the vertebral column is a column usually consisting of 24 articulating vertebrae, and 9 fused vertebrae in the sacrum and the coccyx. It is situated in the dorsal aspect of the torso, separated by intervertebral discs...
  
  
• A non-small cell lung carcinoma staging for a type of tumour

In entertainment

• T4 (Channel 4)
  T4 (Channel 4)
  T4 is a scheduling slot on Channel 4 from about 09:00 until 14:00 on Saturdays and 17:00 on Sundays. It also airs on weekdays in the school holidays. The slot has a separate station identification on screen graphic from Channel 4 and E4. The logo of T4 is noticeably the top right segment of the...
  
  , the weekend morning teen-aimed slot on Channel 4 in UK
• Terminator Salvation
  Terminator Salvation
  Terminator Salvation is a 2009 American science fiction action film directed by McG and starring Christian Bale and Sam Worthington. The fourth installment in the Terminator series, the film is set in 2018 and focuses on the war between Skynet and humanity, with the human Resistance fighting...
  
  , sometimes referred to as Terminator 4

In software and video games

• Text Template Transformation Toolkit
  Text Template Transformation Toolkit
  Microsoft's Text Template Transformation Toolkit is a template based text generation framework included with Visual Studio. T4 source files are usually denoted by the file extension ".tt"....
  
  , a technology developed by Microsoft
• Tekken 4
  Tekken 4
  Tekken 4 is the fifth installment in the Tekken series. It was developed and published by Namco. It was released as an arcade game in 2001 and on the PlayStation 2 in 2002. It is succeeded by Tekken 5.- Gameplay :...
  
  , fighting game

Vehicles

• Kawasaki T-4, a Japanese aircraft
• Sukhoi T-4
  Sukhoi T-4
  -See also:-External links:**...
  
  , a Soviet aircraft
• Tatra T4
  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 DDR, the USSR, Romania and the former Yugoslavia using names T4D, T4SU, T4R and T4YU, respectively...
  
  , a 1967 Czechoslovakian tram
• Volkswagen Transporter series IV van
• A model of the OS T1000 train of the Oslo Metro

Weapons and explosives

• T-4 Atomic Demolition Munition
  T-4 Atomic Demolition Munition
  The T4 Atomic Demolition Munitions were modified versions of the W9 nuclear artillery shells.-History:The T4 was produced in 1957 from recycled W9 fissile components and was in service until 1963, when it was replaced with W30 Tactical Atomic Demolition Munitions and W45 Medium Atomic Demolition...
  
  , a small tactical nuclear bomb
• G7e/T4, a Falke German torpedo
• The Italian name for the high explosive RDX
  RDX
  RDX, an initialism for Research Department Explosive, is an explosive nitroamine widely used in military and industrial applications. It was developed as an explosive which was more powerful than TNT, and it saw wide use in WWII. RDX is also known as cyclonite, hexogen , and T4...
  
  

Other

• A T4 slip, a tax return form used in income taxes in Canada
  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...
  
  
• Action T4
  Action T4
  Action T4 was the name used after World War II for Nazi Germany's eugenics-based "euthanasia" program during which physicians killed thousands of people who were "judged incurably sick, by critical medical examination"...
  
  , a Nazi Germany "euthanasia" program
• Normal space
  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...
  
   in topology
• Paris Tramway Line 4
  Paris Tramway Line 4
  Tramway line T4 is a tram-train line just outside the limits of Paris proper, operating in part on SNCF lines, connecting Bondy RER station with Aulnay-sous-Bois station. It opened on 18 November 2006. Unlike the other tramways in Île-de-France, T4 is operated by SNCF. The line is used by...
  
  
• Traveller (role-playing game)
  Traveller (role-playing game)
  Traveller is a series of related science fiction role-playing games, the first published in 1977 by Game Designers' Workshop and subsequent editions by various companies remaining in print to this day. The game was inspired from such classic science fiction stories as the Dumarest saga series by...
  
  , version 4