Look up T or t in Wiktionary, the free dictionary.

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
• ${\displaystyle \tau }$, 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, 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

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

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 which trades on the New York Stock Exchange as 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

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, 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
• ${\displaystyle \mathbb {T} ^{n))$, the n-dimensional torus (${\displaystyle \mathbb {R} ^{n}/\mathbb {Z} ^{n))$)
• ${\displaystyle \mathbb {T} }$, the Circle group
• A^T, 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)

Transportation

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

Public transport

Japan

• Tanimachi Line, a subway service operated by the Osaka Metro, labeled
• Tokyo Metro Tozai Line, a subway service operated by the Tokyo Metro, labeled
• Tsuyama Line, a railway service operated by West Japan Railway Company, with the official service symbol

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