# T1

T1, T01, T.1 or T-1 may refer to:

## Biology

* The first of the thoracic vertebrae in the vertebral column
* Thoracic spinal nerve 1, a nerve emerging from the vertebrae
* Cyclin T1, a human gene
* GalNAc-T1, a human gene
* Ribonuclease T$_1$, a fungal endonuclease
* TNM staging system, classification for a small cancer tumor
* T1, longitudinal relaxation time, in magnetic resonance imaging (MRI), a measure of the time taken for spinning protons to realign with the external magnetic field

## Computing

* Apple T1, a system on a chip used by Apple
* T1 font, or cork encoding, a character encoding
* T1, a component of the T-carrier system for telecommunication
* UltraSPARC T1, a microprocessor
* AYYA T1, a smartphone developed by Rostec as part of the Ayya (smartphone) line

## Transportation
### Aircraft

* Raytheon T-1 Jayhawk, a jet aircraft used by the US Air Force for advanced pilot training
* Lockheed T2V SeaStar, a.k.a. T1 Seastar, a carrier-capable jet trainer in the US Navy
* Fuji T-1, Japan's first jet-powered trainer aircraft
* Perry Beadle T.1, a 1913 British biplane fighter
* Sopwith Cuckoo, a British biplane torpedo bomber of 1918

### Automobiles

* Bentley T-series, Bentley Motors model in the UK
* Caparo T1, a 2006 British sports car
* CWS T-1, first serially-built car manufactured in Poland
* Ford T1 platform, a large SUV automobile platform
* Mercedes-Benz T1, a 1977 van/truck also called a transporter
* Volkswagen Type 2 (T1), the first generation of Volkswagen transporter

### Rail

* T series (Toronto subway), a subway car in Toronto, Canada
* North Shore & Western Line, a commuter rail line in Sydney, Australia
* Île-de-France tramway Line 1, a.k.a. T1, a tramway near Paris, France
* LSWR T1 class, an 1888 0-4-4T steam tank locomotives class
* Pennsylvania Railroad class T1, a 1942 4-4-4-4 steam locomotive class
* Reading T-1, a 1945 4-8-4 steam locomotive class
* LNER Class T1, a class of British steam locomotives
* Tatra T1, a 1951 Czechoslovakian tramcar
* T1 (İstanbul Tram), a tram line in İstanbul, Turkey
* T1 (Tram İzmir), a tram line in İzmir, Turkey
* Nakano Station (Tokyo), station number T-01 in Tokyo Metro Tozai Line

### Roads

* T1 road (Zambia), a road in Zambia
* T1 road (Tanzania), a road in Tanzania

### Racing

* Ferrari 412 T1, a 1994 Formula One car

### Ships

* USS T-1, several United States Navy ships
* HMNZS Matai (T01), a Royal New Zealand Navy lighthouse tender of 1941
* MV Transpacific (T-1), a 1992 US oil tanker
* Yugoslav torpedo boat T1, a torpedo boat in the Yugoslav Navy, 1921–1941
* T1 tanker a mass-produced tanker used during and after World War II

### Buses

* T1 Bristol–Thornbury, a bus route in England

## Tanks and weapons

* T1 Light Tank, a U.S. prototype tank
* EE-T1 Osório, a 1985 Brazilian main battle tank
* AC NM AE T1 mine, a Brazilian anti-tank blast mine
* AP NM AE T1 mine, a Brazilian anti-personnel mine
* G7a torpedo, a WWII German torpedo

## Mathematics, physics and chemistry

* T1 Aquarii, a star
* T1 Carinae, a star
* Soyuz T-1, a 1979 space mission
* T$_1$ space, a topological space satisfying the T$_1$ separation axiom
* $\mathbb {T} ^{1}$, the 1-torus
* Spin–lattice relaxation time in nuclear magnetic resonance and magnetic resonance imaging

## Other uses

* The Terminator, the first film in the Terminator franchise
* T1 (album), 2018 album by Tatianna
* T1 (classification), a para-cycling classification
* T1 (esports), a South Korean esports team
* T1 General, a tax form used in Canada
* T-1 visa, allowing victims of human trafficking to remain in the United States
* Tour T1, an office skyscraper in La Défense, Paris, France
* T1 Mall of Tallinn, shopping and entertainment centre in Tallinn, Estonia
* Estonian national road 1, officially T1, connecting Tallinn and Narva
* Target One, a Mesoamerican archaeological site in Honduras
* T1, a tornado intensity rating on the TORRO scale
* T+1, "trade date plus one day" in financial markets
* Tekken, a 1994 fighting game
* Tyler1, an American internet personality and streamer on Twitch
* T1 League, a Taiwanese men's professional basketball league
* vivo T1 series, the 5 smartphones manufactured by Vivo Communication Technology Co.