All articles starting with U
6,146 articles
Unravelling (Muse song)
Unravelling is a 2025 single by English rock band Muse, their first new music since Will of the People (2022), produced by Dan Lancaster, built on Matt Bellamy's 8-string guitar, and later track 8 of the 2026 album The Wow! Signal.
Unreal (1998 video game)
Unreal (1998) is a first-person shooter by Epic MegaGames and Digital Extremes, released May 22, 1998, following Prisoner 849 on Na Pali; it debuted the Unreal Engine and UnrealEd, spawned a nine-title franchise, and is now free via OldUnreal after delisting.
Unreal (TV series)
Unreal (styled UnREAL, 2015–2018) is an American Lifetime drama, created by Marti Noxon and Sarah Gertrude Shapiro, behind the scenes of a Bachelor-style dating show called Everlasting, starring Shiri Appleby and Constance Zimmer; its final season moved to Hulu in 2018. Not the Unreal Engine or WWE: Unreal.
Unreal Engine
Unreal Engine is Epic Games' real-time 3D game engine, first shipped in Unreal (1998), now UE5 with Nanite and Lumen; 5% royalty above $1M, used across games, film, and industry.
Unreal Engine 1
Unreal Engine 1 is the first generation of Epic Games' 3D game engine, developed between 1996 and 1999 and debuting with the first-person shooter Unreal in 1998.
Unreal Engine 2
Unreal Engine 2 is a game engine by Epic Games, the second generation of the Unreal Engine series, supporting DirectX 8 and powering PC, Xbox, and PlayStation 2 games.
Unreal Engine 3
Unreal Engine 3 (UE 3.0) is a game engine by Epic Games, used from 2006 as the dominant licensed engine of the Xbox 360 and PlayStation 3 generation.
Unreal Engine 4
Unreal Engine 4 is a game engine developed by Epic Games and first released in 2014, providing C++ code and visual scripting for building games across platforms.
Unreal Engine 5
Unreal Engine 5, also known as UE5, is a real-time 3D creation engine by Epic Games, released in April 2022 and used for games, film virtual production, and simulation.
Unreal Tournament
Unreal Tournament (UT99) is Epic Games and Digital Extremes' 1999 multiplayer arena first-person shooter, born as an Unreal add-on, rival to Quake III Arena, with CTF, Assault, Domination modes; delisted 2022, kept alive by OldUnreal patches.
Unreal Tournament (cancelled video game)
Unreal Tournament (UT4), Epic Games' 2014 free open-development arena FPS reboot led by Steve Polge, built on Unreal Engine 4 via GitHub; development stopped December 2018 amid Fortnite's success, leaving a canceled pre-alpha.
Unreal Tournament 3
Unreal Tournament 3 (also Unreal Tournament III, UT3) is a 2007 first-person arena shooter by Epic Games, published by Midway and released for PC, PlayStation 3, and Xbox 360.
Unrelated cord blood transplantation
Unrelated cord blood transplantation infuses umbilical cord blood from an unrelated donor to rebuild a patient's blood and immune system, treating blood cancers in adults and immunodeficiency in children.
Unreleased Prince projects
Unreleased Prince projects: the shelved albums, songs and films (Dream Factory, Camille, Crystal Ball) left in Prince's Paisley Park vault, and posthumous releases from it, including Piano & a Microphone 1983, Originals, Welcome 2 America, and the 2026 collection Timeless.
Unreleased Sonic the Hedgehog games
Unreleased Sonic the Hedgehog games: cancelled Sega projects, chiefly Sonic X-treme, the Sega Technical Institute Saturn 3D platformer dropped in 1996-97, plus Sonic Crackers, Sonic's Edusoft, SegaSonic Bros., and Sonic Extreme.
Unreliable narrator
Unreliable narrator: a storyteller in fiction or film whose account may not be truthful. Term coined by Wayne C. Booth in The Rhetoric of Fiction (1961); defined by distance from the implied author's norms; examples include Moll Flanders, Roger Ackroyd, and Life of Pi.
Unrepeatered transmission
Unrepeatered transmission, also called repeaterless transmission, is submarine optical communication over a passive fiber link with no powered in-line equipment, typically reaching 300 to 600 km.
Unrepresented Nations and Peoples Organization
Founded on February 11, 1991, in The Hague, the Unrepresented Nations and Peoples Organization is an international body. It represents over 40 communities and 300 million people globally.
Unrequited love
Unrequited Love (暗恋橘生淮南) is a 2021 Chinese youth campus romance web series directed by Li Muge, starring Hu Yitian and Hu Bingqing, released in 24 episodes.
Unresolved
Unresolved is the stage name of Ihor Fedorutsa, a Ukrainian raw hardstyle DJ and producer active since 2014 who runs RSLVD Records and has played festivals including Defqon.1.
Unrestricted grammar
Unrestricted grammar (Type-0, phrase-structure grammar): formal grammar with productions u→v, u nonempty; generates exactly the recursively enumerable languages, equivalent to Turing machines; membership is undecidable.
Unrestricted submarine warfare
Unrestricted submarine warfare, Germany's WWI naval policy of sinking any ship in a zone without warning, practiced in 1915 and again from February 1917, causing record shipping losses, the convoy response, and US entry into the war.
Unrivaled (basketball)
Unrivaled is a women's 3-on-3 basketball league founded in 2023 by WNBA stars Napheesa Collier and Breanna Stewart, played in Miami during the WNBA offseason.
Unruh effect
The Unruh effect, also called the Davies-Unruh effect, is the quantum field theory prediction that an accelerating observer sees empty space as a warm bath of particles.
UNRWA
UNRWA (United Nations Relief and Works Agency for Palestine Refugees in the Near East) is a UN agency, created 1949, serving about 5.9 million registered Palestine refugees in Jordan, Lebanon, Syria, the West Bank, and Gaza through education, health, relief, and emergency services.
UNRWA and Israel
UNRWA and Israel covers relations between the UN Palestine refugee agency and Israel: the 1967 facilitation correspondence, January 2024 staff allegations, Colonna and OIOS investigations, the October 2024 Knesset ban laws, and the US$450 million donor funding suspension.
Unsane
Unsane (2018) is Steven Soderbergh's psychological thriller starring Claire Foy as an involuntarily committed stalking victim; shot entirely on iPhone 7 Plus with Moment lenses, released March 23, 2018.
Unsaturated and benzylic alcohols
Unsaturated and benzylic alcohols are alcohols whose hydroxyl-bearing carbon sits next to a double bond (allylic) or aromatic ring (benzylic), which changes their acidity and reactivity.
Unsaturated fat
An unsaturated fat is a fat whose fatty acids contain one or more carbon–carbon double bonds, which lowers melting point, so olive and sunflower oils are liquid at room temperature.
Unsaturated polyester resin
Unsaturated polyester resin is a thermosetting material made of an unsaturated polyester dissolved in a reactive monomer, usually styrene, and cured by free-radical crosslinking; it dominates composites as coatings and matrices.