T is the twentieth letter of the Latin alphabet. (For the same letterform in the Cyrillic and Greek alphabets, see Te and Tau respectively). 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

Entertainment

Literature

* ''T'' (''New York Times''), a fashion magazine * ''T'', a novel by Victor Pelevin *

T-unit In linguistics, the term T-unit was coined by Kellogg Hunt in 1965. It is defined as the "shortest grammatically allowable sentences into which (writing can be split) or minimally terminable unit." Often, but not always, a T-unit is a sentence. ...

, a grammatical term * ''

"T" Is for Trespass ''"T" Is for Trespass'' is the 20th novel in Sue Grafton's "Alphabet" series of mystery novels and features Kinsey Millhone, a private eye based in the fictional Santa Teresa, California. Plot summary Kinsey's cantankerous neighbor Gus is badly ...

'', the twentieth novel in Sue Grafton's "Alphabet mystery" series, published in 2007

Television

* Mr. T (b. 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

Music

* ''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 The Entertainment Software Rating Board (ESRB) is a self-regulatory organization that assigns age and content ratings to consumer video games in the United States and Canada. The ESRB was established in 1994 by the Entertainment Software Asso ...

which the board believes is suitable for those aged 13 years and older

Finance and business

* T-Mobile, mobile network operator based in Germany * T-Online, German Internet Service Provider * Treasury (as in T-Bill, T-Bond, T-Note) * T, a

mintmark A mint mark is a letter, symbol or an inscription on a coin indicating the mint where the coin was produced. It should not be confused with a mintmaster mark which is the mark of the mintmaster. History Mint marks were first developed to locate ...

for Nantes, France * T, the U.S. ticker symbol for AT&T on the New York Stock Exchange * The AT&T Center in San Antonio, Texas, United States

Science

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 Threonine (symbol Thr or T) is an amino acid that is used in the biosynthesis of proteins. It contains an α-amino group (which is in the protonated −NH form under biological conditions), a carboxyl group (which is in the deprotonated −COO� ...

, 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 Electrocardiography is the process of producing an electrocardiogram (ECG or EKG), a recording of the heart's electrical activity. It is an electrogram of the heart which is a graph of voltage versus time of the electrical activity of the hear ...

* 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) The symbols Δt and ΔT (spoken as "delta T") are commonly used in a variety of contexts. Time * ΔT (timekeeping) the difference between two time scales, Universal Time and Terrestrial Time, which results from a drift in the length of a day * The ...

: a variety of meanings related to changes in a quantity denoted by T, such as time or temperature

Mathematics

T score In statistics, the standard score is the number of standard deviations by which the value of a raw score (i.e., an observed value or data point) is above or below the mean value of what is being observed or measured. Raw scores above the mean ...

, a statistical term *

Student's t-distribution In probability and statistics, Student's ''t''-distribution (or simply the ''t''-distribution) is any member of a family of continuous probability distributions that arise when estimating the mean of a normally distributed population in sit ...

, statistical term * System T, in

modal logic Modal logic is a collection of formal systems developed to represent statements about necessity and possibility. It plays a major role in philosophy of language, epistemology, metaphysics, and natural language semantics. Modal logics extend other ...

\mathbb^n

, the ''n''-dimensional torus (

\mathbb^n/\mathbb^n

) *

\mathbb

, the

Circle group In mathematics, the circle group, denoted by \mathbb T or \mathbb S^1, is the multiplicative group of all complex numbers with absolute value 1, that is, the unit circle in the complex plane or simply the unit complex numbers. \mathbb T = \ ...

*A^T, the transpose of a

matrix Matrix most commonly refers to: * ''The Matrix'' (franchise), an American media franchise ** ''The Matrix'', a 1999 science-fiction action film ** "The Matrix", a fictional setting, a virtual reality environment, within ''The Matrix'' (franchis ...

Technology and computing

T (programming language) T is a dialect of the Scheme programming language developed in the early 1980s by Jonathan A. Rees, Kent M. Pitman, and Norman I. Adams of Yale University as an experiment in language design and implementation. Rationale T's purpose is to test t ...

, 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 t-distributed stochastic neighbor embedding (t-SNE) is a statistical method for visualizing high-dimensional data by giving each datapoint a location in a two or three-dimensional map. It is based on Stochastic Neighbor Embedding originally de ...

, 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 signal square is an aerodrome equipment internationally defined at the annex 14 of the Convention on International Civil Aviation by the International Civil Aviation Organization. It contains ground symbols to indicate visually the conditions on 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)

Transportation

Equipment

Ford Model T The Ford Model T is an automobile that was produced by Ford Motor Company from October 1, 1908, to May 26, 1927. It is generally regarded as the first affordable automobile, which made car travel available to middle-class Americans. The relati ...

, produced 1908–1927 * NZR T class steam locomotives in New Zealand * Tank locomotive * OS T1000, an Oslo Metro train *

T gauge T gauge (1:450 or 1:480) is a model railway scale with a track gauge of , referred from "Three-millimeter gauge" or "Third of N scale". It was introduced at the Tokyo Toy Show in 2006 by KK Eishindo of Japan, and went on sale in 2007. It is th ...

, a scale for model railroad trains

Public transport

* Massachusetts Bay Transportation Authority (nicknamed the "T") * T Third Street in San Francisco, California * Oslo Metro or * Pittsburgh Light Rail, commonly called the T *

Stockholm Metro The Stockholm metro ( sv, Stockholms tunnelbana) is a rapid transit system in Stockholm, Sweden. The first line opened in 1950, and today the system has 100 stations in use, of which 47 are underground and 53 above ground. There are three colou ...

or ''T-bana'' *

T (New York City Subway service) The T Second Avenue Local is a prospective rapid transit service in the B Division of the New York City Subway. It is proposed to run on the Second Avenue Subway in Manhattan and its route symbol will be . The first phase of the Second Avenue ...

Trinity Metro Trinity Metro is a transit agency located in and serving the city of Fort Worth, Texas and its suburbs in surrounding Tarrant County, Texas, Tarrant County, part of the Dallas–Fort Worth metropolitan area. Since 1983, it was previously known off ...

, formerly known as "The T"

Phonetics

* the

International Phonetic Alphabet The International Phonetic Alphabet (IPA) is an alphabetic system of phonetic transcription, phonetic notation based primarily on the Latin script. It was devised by the International Phonetic Association in the late 19th century as a standa ...

character for the voiceless alveolar plosive * � 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 Pennsyltucky is a slang portmanteau of the names of the U.S. states of Pennsylvania and Kentucky. It is used to characterize—usually humorously, but sometimes deprecatingly—the rural part of Pennsylvania outside the Pittsburgh and Phi ...

* 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 Crossing the ''T'' or capping the ''T'' is a classic naval warfare tactic used from the late 19th to the mid-20th centuries in which a line of warships crosses in front of a line of enemy ships to allow the crossing line to bring all their guns ...

, 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