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Tracking (typography)
Tracking, also called letterspacing, is the uniform adjustment of space between characters across a range of text, distinct from kerning, which adjusts individual letter pairs.
Tracking and Data Relay Satellite System
The Tracking and Data Relay Satellite System (TDRSS) is NASA's constellation of geostationary communications satellites, operating since 1983, that gives the International Space Station and Hubble near-continuous contact with Earth.
Tracking error
Tracking error is the annualized standard deviation of return differences between a portfolio and its benchmark index, measuring variability of active return rather than the signed gap.
Tracking number
A tracking number is a unique identifier for a mailpiece, parcel, or freight shipment, typically printed as a barcode and scanned at each step to record its movement history.
Tracking shot
Tracking shot (also travelling, trucking, follow shot): a film shot in which the camera physically moves through space to follow a subject, traditionally on a dolly on track, now also Steadicam, gimbal, vehicle, or drone; distinct from pan, tilt, and zoom; famous examples include Goodfellas and Touch of Evil.
TrackMania
TrackMania (Trackmania) is a Ubisoft Nadeo racing-game series since 2003, built on block-based track creation and time-trial racing; the 2020 free-to-play Trackmania hosts the World Tour 2v2 esports circuit and Esports World Cup qualification.
TrackMania Nations
TrackMania Nations (TrackMania Nations ESWC, TMN) is Nadeo's free 2006 arcade racer introducing the Stadium environment, made with ESWC; its 2008 sequel Nations Forever added 65 tracks and reached over 30 million players.
Tracks (2013 film)
Tracks (2013) is an Australian biographical drama directed by John Curran, adapted from Robyn Davidson's 1980 memoir, starring Mia Wasikowska and Adam Driver. It depicts Davidson's 1977 2,700 km desert trek, premiered at Venice 2013, and earned four AACTA nominations.
Tracks in the Snowy Forest
Tracks in the Snowy Forest (Lin Hai Xue Yuan, 林海雪原) is a 1957 novel by Qu Bo recounting a 36-man PLA detachment's fight against bandits in 1946 northeast China.
Tract housing
Tract housing, also known as tract homes, is housing built by a production builder on a large subdivided parcel, using standardized floor plans and model homes.
Tractable (company)
Tractable is a London-based artificial intelligence company founded in 2014 that uses computer vision to estimate vehicle repair costs from smartphone photos for insurers, reaching a $1 billion valuation in 2021.
Tractatus Logico-Philosophicus
Tractatus Logico-Philosophicus (Logisch-philosophische Abhandlung), Wittgenstein's 1921/1922 picture-theory work on language, world, and the limits of sense; his only lifetime book, seven numbered propositions, influential on the Vienna Circle.
Tractatus Theologico-Politicus
Tractatus Theologico-Politicus (Theological-Political Treatise), Spinoza's anonymous 1670 Latin work defending freedom to philosophize, subordinating religion to the sovereign, and founding historical biblical criticism.
Tractian
Tractian is an Atlanta-based industrial AI company that uses sensors and software to predict machine failures in factories. It was founded in 2019 by Igor Marinelli.
Traction
Traction (orthopedics): pulling force applied to limbs, pelvis, or spine via skin or skeletal traction to reduce fractures and dislocations; Thomas splint cut WWI femur fracture mortality by 65%, but routine preoperative hip-fracture traction now shows no benefit.
Traction control system
The traction control system (TCS), also known as acceleration slip regulation or anti-slip regulation, is an electronic safety system that reduces wheel spin by cutting engine torque or braking spinning wheels.
Traction force microscopy
Traction force microscopy (TFM) is a cell biology technique that measures the forces adherent cells exert by tracking deformation of fluorescent beads in a soft elastic gel, producing traction maps.
Traction motor
A traction motor is an electric motor used for propelling rail or road vehicles; three-phase induction motors, adopted in the 1990s, are now the dominant railway type.
Traction therapy
Traction therapy applies a pulling force to the spine to separate vertebrae and relieve pain; it remains widely used despite reviews finding little or no benefit.
Traction transformer
A traction transformer, also called a railway traction or locomotive transformer, converts high railway supply voltage into lower voltages for train propulsion and auxiliary systems like lighting and HVAC.
Traction–separation law
A traction–separation law (TSL) is a fracture mechanics relation linking cohesive traction across a crack surface to its separation, central to cohesive zone modeling since Barenblatt's 1962 theory.
Tractography
Tractography, also called MRI tractography, is a computational method that reconstructs the brain's white-matter fiber pathways from diffusion MRI data, first demonstrated in vivo in 1999 and used mainly for preoperative planning.
Tractometry
Tractometry is a diffusion MRI analysis method that quantifies diffusion-derived tissue metrics along reconstructed white matter tracts, producing detailed along-tract profiles used to study development, disease, and the visual system.
Tractor
A tractor is a self-propelled vehicle that pulls or powers farm and industrial implements, replacing horses as the main source of farm power in the twentieth century.
Tractor beam
A tractor beam is a wave beam, optical or acoustic, that pulls an object toward its source, named after the device conceived by Edward E. Smith in 1930s science fiction.
Tractor Beverage Company (Tractor Beverages, Inc.)
Tractor Beverage Company is a farmer-founded, employee-owned American beverage company, founded in 2014, that sells Certified Organic sodas and fountain drinks through foodservice, including Chipotle.
Tractor configuration
The tractor configuration places an aircraft's engine and propeller ahead of the wing or fuselage, pulling it forward; the nose-mounted single-engine version is the most common layout for light aircraft.
Tractor pulling
Tractor pulling, or power pulling, is a motorsport where tractors and trucks drag a weight-transfer sled down a 100 m track; farthest pull wins. First held 1929 in Missouri and Ohio; governed by NTPA and ETPC.
Tractor S.C.
Tractor S.C. (Tractor-Sazi), Tabriz football club founded 1970 by Iran Tractor Manufacturing Co.; Azeri identity symbol; first Persian Gulf Pro League title 2024-25, Hazfi Cup 2014-15 and 2019-20, 2025 Super Cup.
Tractor Supply Company
Tractor Supply Company, also known as Tractor Supply Co., is the largest rural lifestyle retailer in the United States, selling feed, pet food, and farm equipment.