T (disambiguation)

T, or t, is the twentieth letter of the English alphabet.

T may also refer to:

Codes and units

 * T, Tera- as in one trillion
 * T, the symbol for "True" in logic
 * T, the usual symbol for period, the reciprocal of frequency
 * T, the symbol for Tesla, the SI unit of magnetic field
 * t, the SI symbol for tonne or metric ton
 * t, the usual symbol for time
 * t, the angular coordinate of the polar coordinate system (usually ϕ or θ) is sometimes denoted by t
 * $\tau$, the symbol for torque
 * ⊤, the top element of a partially ordered set
 * T, short for tablespoon
 * t, short for teaspoon

Names

 * Titus (praenomen), common name throughout Roman history, regularly abbreviated T

Literature

 * T, a novel by Victor Pelevin
 * T (magazine), a fashion magazine, full name T: The New York Times Style Magazine
 * "T" Is for Trespass, the twentieth novel in Sue Grafton's "Alphabet mystery" series, published in 2007
 * T-unit, a grammatical term

Film and television

 * Big T, ring name of American retired professional wrestler Ahmed Johnson (born 1963)
 * Mr. T (born 1952), American television actor
 * T, the production code for the 1965 Doctor Who serial Galaxy 4
 * The T logo for the American Spanish-language network Telemundo
 * T (2023 film), an Indian Odia-language film by Jitesh Kumar Parida

Music

 * Ice-T (born 1958), American rapper and actor
 * T (Funker Vogt album), a 2000 aggrotech album by Funker Vogt
 * T (TVXQ album), a 2008 TVXQ album
 * T (Teflon Brothers album), a 2009 album by Finnish hip hop group Teflon Brothers
 * "t," an Iamamiwhoami song
 * T, abbreviation for tutti
 * T, abbreviation for tenor
 * t, note abbreviation in tonic sol-fa for seventh scale degree
 * T-Babe, a virtual pop singer

Video games

 * T (teen), a game rating from the Entertainment Software Rating Board which the board believes is suitable for those aged 13 years and older

Finance and business

 * AT&T, an American phone company with the New York Stock Exchange ticker symbol T
 * T-Mobile International AG, mobile network operator based in Germany
 * T-Systems, German IT services company
 * T-Online, German Internet Service Provider
 * Treasury (as in T-Bill, T-Bond, T-Note)
 * T, a mintmark for Nantes, France

Biology and medicine

 * Troponin T, one of the three troponins
 * Haplogroup T (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup
 * T cells, part of the components of the immune system along with B cells
 * T, the one-letter code used for threonine, one of the 20 amino acids used in transcription of a polypeptide chain
 * Thymine, one of the four nucleic acids of DNA
 * T, gene and protein symbol for the transcription factor brachyury
 * Thoracic vertebrae T-1 through T-12
 * T wave, the repolarization wave of cardiac ventricles in electrocardiography
 * T, a common abbreviation for the male sex hormone testosterone

Palaeontology

 * T-rex, abbreviation for Tyrannosaurus rex

Meteorology

 * Thunderstorm
 * T-number in the Dvorak technique, a way to rate storm intensity

Physics and chemistry

 * T, symbol for tritium, a radioactive isotope of hydrogen
 * T-symmetry in particle physics
 * Class T, a cool brown dwarf class of stars
 * ΔT (disambiguation): a variety of meanings related to changes in a quantity denoted by T, such as time or temperature

Mathematics

 * T score, a statistical term
 * Student's t-distribution, statistical term
 * System T, in modal logic
 * $$\mathbb{T}^n$$, the n-dimensional torus ($$\mathbb{R}^n/\mathbb{Z}^n$$)
 * $$\mathbb{T}$$, the Circle group
 * AT, the transpose of a matrix A

Technology and computing

 * T (programming language), created in the early 1980s
 * T, Toshiba's mobile phones in Japan
 * T, an abbreviation for telephone number
 * t, an abbreviation for microblogging service Twitter
 * t-distributed stochastic neighbor embedding, a machine learning algorithm for data visualization
 * T-pose, a default pose for a 3D model's skeleton before it is animated
 * Landing T, a ground signal that indicates the wind direction in aerodromes
 * Transfer (computing), in computer technology, a data transfer, often used to measure speed (e.g. megatransfers per second)

Equipment

 * Ford Model T, a motor car produced in the U.S. 1908–1927
 * NZR T class steam locomotives in New Zealand
 * OS T1000, an Oslo Metro train
 * T gauge, a scale for model railroad trains
 * Tank locomotive

Japan

 * Tanimachi Line, a subway service operated by the Osaka Metro, labeled Osaka Metro Tanimachi line symbol.svg
 * Tokyo Metro Tozai Line, a subway service operated by the Tokyo Metro, labeled Logo of Tokyo Metro Tōzai Line.svg
 * Tsuyama Line, a railway service operated by West Japan Railway Company, with the official  service symbol JRW oka-T.svg

United States

 * Massachusetts Bay Transportation Authority (nicknamed the "T")
 * Pittsburgh Light Rail, commonly called the T
 * T (New York City Subway service)
 * T Line (Sound Transit) in Tacoma, Washington
 * T Third Street in San Francisco, California
 * Trinity Metro, formerly known as "The T", a transit agency serving Fort Worth, Texas and suburbs

Other countries

 * Oslo Metro or Oslo T-bane
 * Stockholm Metro or T-bana

Phonetics

 * [t], the International Phonetic Alphabet character for the voiceless alveolar plosive
 * [ʈ], the IPA character representing the voiceless retroflex stop

Other uses

 * "The T", a nickname for the rural part of Pennsylvania due to its shape when eliminating the Pittsburgh and Philadelphia Metropolitan Areas, also known by its slang term Pennsyltucky
 * Т, a letter of the Cyrillic alphabet
 * T-bone steak, the cut of meat
 * T-shirt, a type of clothing
 * T in the Park, an annual music festival, held in Kinross, Scotland and named after its main sponsor, the brewing company Tennents
 * Crossing the T, a classic naval warfare tactic
 * Stealing the 'T', an historic college prank as the "T" is stolen from the Tech Tower at the Georgia Institute of Technology
 * T (Tango), the military time zone code for UTC−07:00