3 (disambiguation)
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3 and three are used in many contexts:
As a number or year
In a name
- Three-toed woodpecker
- Triceratops - a dinosaur
- Ternary logic - a computing system using base three
- Triangulum and Triangulum Australe - constellations
- 3 (band) - a rock band formed by Keith Emerson, Robert Berry and Carl Palmer
- 3 (telecommunications) - a 3G operator in Europe, Australia and Hong Kong
- Three (album)
- Three (movie)
- Three (novel)
- threedegrees - an instant messaging software created by Microsoft
- Three Gorges
- Three Kingdoms
- The Three Stooges
In a term or phrase
- 3-D - three-dimensional, particularly with respect to graphics and images
- Hendiatris - a rhetorical figure employing three words for one thing
- Trireme - a seafaring vessel (with three sails?), captained by a Trierarch
- Three-spine stickleback - a type of fish
- Triangulation - using the geometry of multiple sightings to determine one's location.
- Triassic Period - geologic time
- Triceps - a muscle
- Triclinium - a couch to three sides of table
- Trillion - 1012 (American) 1018 (British)
- Trilobite - a marine arthropod
- Trigeminus - trigeminal nerve
- Trigon - triangular harp
- Trigonometry - a branch of mathematics
Groups of three
See also: List of famous trinities, trios, triplets, or threesomes
- Triad - a group of three
- Threesome - trio
- Threepence - three-penny coin
- Thrice - three times
- Tripartition - division into three parts
- Tripod - a three-legged structure
- Triptych - an artwork consisting of three painted or carved panels that are hinged together
- Triarchy - government of three
- Trialogue - conversation among three
- Three-decker - a ship of three decks
- Triangle - polygon with three sides
- Triathlon - a three-sport event; competitors in the event are called triathletes
- Tribrach - metrical foot, in poetry
- Trichotomy - division into three parts
- Trichroism - property of minerals such as tanzanite, andalusite and iolite
- Trichromatism - of three-color technology or perception
- Tricolor - three-color flag, as in France, Romania, Moldova
- Tricorn - of three corners, e.g., a hat with "tricorned brim"
- Tricuspid - of three cusps
- Tricycle - a three-wheeled bicycle
- Tridactyl - of three toes
- Trident - of three teeth or prongs
- Triennium - three-year time
- Trifid - cleft into three
- Trifocal - a lens (e.g., of eyeglasses) with three focal lengths
- Trifoliate - a leaf structure
- Triforium - a certain gallery in church
- Trifurcate - threeforked or threestemmed
- Triglyph - an architectural ornament distinctive to Doric friezes
- Trigram - an I Ching glyph
- Trigraph - three-letter combination
- Trihedron - afigure of three meeting planes
- Trihybrid - a kind of hybrid
- Trilateral - of three sides or parties
- Trilingual - able of or expressed in three languages
- Triliteral - a word or root of three letters
- Trilithon - prehistoric three-stone structure
- Trilobate - of three lobes
- Trilogy - three works on a theme under the same authorship
- Trinity - The Christian godhead of Father, Son, and Holy Ghost.
- Trio - three musicians or three actors
- Triumvirate - government of three
- Trivium - grammar+logic+rhetoric ("three roads")
- Troika
In chemistry
there are an endless number of possible chemical terms with three of something in them; these are among the more notable ones: Triacid, Triaminic, Triamcinolone, Triazine, Triazole, Tribromoethanol, Trichloroethylene, Trichlorfon, Trifluralin, Triglyceride, Triglycerophosphate, Triphosphopyridine nucleotide