T is the twentieth letter of the Latin alphabet. (For the same

letterform A letterform, letter-form or letter form, is a term used especially in typography, palaeography, calligraphy and epigraphy to mean a letter's shape. A letterform is a type of glyph, which is a specific, concrete way of writing an abstract ch ...

in the Cyrillic and Greek alphabets, see Te and

Tau Tau (uppercase Τ, lowercase τ, or \boldsymbol\tau; el, ταυ ) is the 19th letter of the Greek alphabet, representing the voiceless dental or alveolar plosive . In the system of Greek numerals, it has a value of 300. The name in English ...

respectively). T may also refer to:

Codes and units

* T,

Tera- A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit. All metric prefixes used today are decadic. Each prefix has a unique symbol that is prepended to any unit symbol. The pre ...

as in one trillion * T, the symbol for "True" in

logic Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the science of deductively valid inferences or of logical truths. It is a formal science investigating how conclusions follow from premises ...

* T, the usual symbol for period, the reciprocal of

frequency Frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as ''temporal frequency'' for clarity, and is distinct from ''angular frequency''. Frequency is measured in hertz (Hz) which is eq ...

* T, the symbol for Tesla, the SI unit of magnetic field * t, the SI symbol for

tonne The tonne ( or ; symbol: t) is a unit of mass equal to 1000 kilograms. It is a non-SI unit accepted for use with SI. It is also referred to as a metric ton to distinguish it from the non-metric units of the short ton ( United State ...

or ''metric ton'' * t, the usual symbol for

time Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present, into the future. It is a component quantity of various measurements used to sequence events, to ...

* t, the angular coordinate of the

polar coordinate system In mathematics, the polar coordinate system is a two-dimensional coordinate system in which each point on a plane is determined by a distance from a reference point and an angle from a reference direction. The reference point (analogous to the or ...

(usually ϕ or θ) is sometimes denoted by t *

\tau

, the symbol for

torque In physics and mechanics, torque is the rotational equivalent of linear force. It is also referred to as the moment of force (also abbreviated to moment). It represents the capability of a force to produce change in the rotational motion of th ...

* ⊤, 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 Telemundo (; formerly NetSpan) is an American Spanish-language Terrestrial television, terrestrial television network owned by NBCUniversal Television and Streaming#NBCUniversal Telemundo Enterprises, NBCUniversal Telemundo Enterprises, a divi ...

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 ''Tutti'' is an Italian word literally meaning ''all'' or ''together'' and is used as a musical term, for the whole orchestra as opposed to the soloist. It is applied similarly to choral music, where the whole section or choir is called to sing. M ...

* T, abbreviation for

tenor A tenor is a type of classical music, classical male singing human voice, voice whose vocal range lies between the countertenor and baritone voice types. It is the highest male chest voice type. The tenor's vocal range extends up to C5. The lo ...

* t, note abbreviation in tonic sol-fa for seventh scale degree *

T-Babe T-Babe (stylised as t-babe) was a virtual pop singer created by husband-and-wife team Sascha and Tessa Hartmann for their independent record label Glasgow Records. The couple were looking to sign an artist to sing the dance tunes that Sascha had w ...

, 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 A treasury is either *A government department related to finance and taxation, a finance ministry. *A place or location where treasure, such as currency or precious items are kept. These can be state or royal property, church treasure or in p ...

(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 AT&T Inc. is an American multinational telecommunications holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. It is the world's largest telecommunications company by revenue and the third largest provider of mobile tel ...

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) Haplogroup T is a human mitochondrial DNA (mtDNA) haplogroup. It is believed to have originated around 25,100 years ago in the Near East. Origins Mitochondrial clade T derives from the haplogroup JT, which also gave rise to the mtDNA haplogr ...

, 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 Peptides (, ) are short chains of amino acids linked by peptide bonds. Long chains of amino acids are called proteins. Chains of fewer than twenty amino acids are called oligopeptides, and include dipeptides, tripeptides, and tetrapeptides. A p ...

Thymine Thymine () ( symbol T or Thy) is one of the four nucleobases in the nucleic acid of DNA that are represented by the letters G–C–A–T. The others are adenine, guanine, and cytosine. Thymine is also known as 5-methyluracil, a pyrimidine nu ...

, 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 In electrocardiography, the T wave represents the repolarization of the ventricles. The interval from the beginning of the QRS complex to the apex of the T wave is referred to as the ''absolute refractory period''. The last half of the 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 Testosterone is the primary sex hormone and anabolic steroid in males. In humans, testosterone plays a key role in the development of Male reproductive system, male reproductive tissues such as testes and prostate, as well as promoting secondar ...

Palaeontology

T-rex ''Tyrannosaurus'' is a genus of large theropod dinosaur. The species ''Tyrannosaurus rex'' (''rex'' meaning "king" in Latin), often called ''T. rex'' or colloquially ''T-Rex'', is one of the best represented theropods. ''Tyrannosaurus'' live ...

, abbreviation for '' Tyrannosaurus rex''

Meteorology

Thunderstorm A thunderstorm, also known as an electrical storm or a lightning storm, is a storm characterized by the presence of lightning and its acoustic effect on the Earth's atmosphere, known as thunder. Relatively weak thunderstorms are someti ...

* T-number in the

Dvorak technique The Dvorak technique (developed between 1969 and 1984 by Vernon Dvorak) is a widely used system to estimate tropical cyclone intensity (which includes tropical depression, tropical storm, and hurricane/typhoon/intense tropical cyclone intensitie ...

, 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 In geometry, a torus (plural tori, colloquially donut or doughnut) is a surface of revolution generated by revolving a circle in three-dimensional space about an axis that is coplanar with the circle. If the axis of revolution does not tou ...

(

\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 , commonly known as Toshiba and stylized as TOSHIBA, is a Japanese multinational conglomerate corporation headquartered in Minato, Tokyo, Japan. Its diversified products and services include power, industrial and social infrastructure system ...

's mobile phones in Japan * T, an abbreviation for

telephone number A telephone number is a sequence of digits assigned to a landline telephone subscriber station connected to a telephone line or to a wireless electronic telephony device, such as a radio telephone or a mobile telephone, or to other devices f ...

* t, an abbreviation for microblogging service

Twitter Twitter is an online social media and social networking service owned and operated by American company Twitter, Inc., on which users post and interact with 280-character-long messages known as "tweets". Registered users can post, like, and ...

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 In computer animation, a T-pose, also known as a bind pose or reference pose, is a default posing for a 3D model's skeleton before it is animated. It is called so because of its shape: the straight legs and arms of a humanoid model combine to ...

, 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 A tank locomotive or tank engine is a steam locomotive that carries its water in one or more on-board water tanks, instead of a more traditional tender. Most tank engines also have bunkers (or fuel tanks) to hold fuel; in a tender-tank locom ...

* 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 The Massachusetts Bay Transportation Authority (abbreviated MBTA and known colloquially as "the T") is the public agency responsible for operating most public transportation services in Greater Boston, Massachusetts. The MBTA transit network in ...

(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 voiceless alveolar, dental and postalveolar plosives (or stops) are types of consonantal sounds used in almost all spoken languages. The symbol in the International Phonetic Alphabet that represents voiceless dental, alveolar, and postal ...

* � the IPA character representing the

voiceless retroflex stop The voiceless retroflex plosive or stop is a type of consonantal sound, used in some spoken languages. This consonant is found as a phoneme mostly (though not exclusively) in two areas: South Asia and Australia. Transcription The symbol that r ...

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 T-shirt (also spelled tee shirt), or tee, is a style of fabric shirt named after the T shape of its body and sleeves. Traditionally, it has short sleeves and a round neckline, known as a ''crew neck'', which lacks a collar. T-shirts are general ...

, 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