T3

T3 or T-3 may refer to:

Medicine

 * T3, in endocrinology, triiodothyronine, a thyroid hormone
 * Polar T3 syndrome, characterized by low levels of that hormone in polar explorers
 * T3 spinal nerve
 * Third thoracic vertebrae


 * An electrode site, in the 10–20 EEG system

Vehicles and transportation

 * Bankstown Line, a rail service in Sydney, Australia, numbered T3
 * Eastern Airways (IATA code)
 * Fuji T-3, a Japanese primary military trainer aircraft
 * T3, a model of the Oslo Metro OS T1000 train
 * Île-de-France tramway Line 3, in Paris
 * Tatra T3, a tramcar
 * Trager-Bierens T-3 Alibi, a glider
 * T3 transit lane, a type of high-occupancy vehicle lane in Australia
 * Volkswagen Type 2 (T3), the third generation of the Volkswagen Transporter van
 * T3 tanker, a ship class
 * Slingsby T-3A Firefly, a former training aircraft of the United States Air Force
 * T3 road (Tanzania), a road in Tanzania
 * T3 road (Zambia), a road in Zambia
 * Heathrow Terminal 3

Entertainment

 * T3: Alliance, an investigative-public affairs program of TV5 in the Philippines
 * T3 (magazine), focusing on new and hi-tech gadgets
 * Terminator 3: Rise of the Machines, the third film in the Terminator series
 * Tekken 3, a 1997 fighting game in the Tekken franchise
 * Tiger 3, a 2023 Indian action thriller film in the YRF Spy Universe

Other uses

 * Axiom T3 or T3 space, regular space in topology and related fields of mathematics
 * T3, a halogen light bulb form factor
 * T3 Technion Technology Transfer, the technology transfer office of the Technion Israel Institute of Technology
 * SPARC T3, a CPU introduced by Sun Microsystems in 2010
 * Digital Signal 3, or T3 line, a type of telecommunications service
 * Fletcher's Ice Island or T-3, an iceberg and scientific research station
 * T3 (company), the largest woman-owned advertising agency in the US
 * T3 (rapper), founding member of the band Slum Village
 * T3 (skyscraper), a skyscraper office building in Taichung, Taiwan
 * Tungsten T3, a device in the line of palmOne handhelds
 * Tokyo Teleport Town, a planned city on Odaiba, reclaimed land in Tokyo Bay
 * T3, a privatisation offering of the company Telstra
 * Talking tactile tablet, a touch sensitive device for visually impaired people
 * T3, part of the T-carrier telecommunications system, specifying a channel with a bandwidth of 44.736 Mbit/s, capable of carrying 672 voice calls simultaneously
 * Canon EOS Rebel T3, a digital camera
 * T3, a bedside television unit built by Hospedia
 * T-3, the third Jupiter Trojan survey, a subproject of the Palomar–Leiden survey
 * T3 (roller coaster) at Kentucky Kingdom
 * Sony Xperia T3, an Android smartphone
 * A tornado intensity rating on the TORRO scale
 * Tikka T3, a series of Finnish bolt-action rifles
 * T+3, "trade date plus three days" in financial markets