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Arçelik
Arçelik is a Turkish multinational home appliance manufacturer founded in Istanbul in 1955, controlled by Koç Holding, and owner of 22 brands including Beko and Grundig.
Arcella
Arcella is a genus of shelled (testate) amoebae in Arcellidae, Arcellinida, Amoebozoa, erected by Ehrenberg in 1830 with type species Arcella vulgaris; worldwide in freshwaters and peatlands, with hexagonal-unit tests and the 2021 split-off genus Galeripora.
Arcellinida
Arcellinida (Kent 1880) is an order of testate amoebae in Amoebozoa, Tubulinea, with lobose pseudopods and shells of proteinaceous, calcareous, or siliceous material; 687 nominal species, Neoproterozoic fossils, and wide use as bioindicators.
Arcellx, Inc.
Arcellx, Inc., originally incorporated as Encarta Therapeutics in 2014, was a clinical-stage biotechnology company in Gaithersburg, Maryland, developing CAR-T cell therapies for cancer before Gilead Sciences acquired it in 2026.
Arcelor
Arcelor was a Luxembourg-based steel company created in 2002 by the merger of Arbed, Aceralia, and Usinor, and absorbed into ArcelorMittal after Mittal Steel's 2006 takeover.
ArcelorMittal
ArcelorMittal is a Luxembourg-domiciled steel and mining company created in 2007 from the merger of Mittal Steel and Arcelor, and the world's second-largest crude steel producer.
ArcelorMittal Dofasco
ArcelorMittal Dofasco is an integrated steelmaker in Hamilton, Ontario, Canada. Founded in 1912, it is the country's largest flat-rolled steel producer and Hamilton's largest private employer.
ArcelorMittal Sestao plant
ArcelorMittal Sestao is a flat steel plant in Sestao, in Spain's Basque Country, that ArcelorMittal has designated to become the world's first full-scale zero carbon-emissions steel plant.
ArcelorMittal Temirtau
ArcelorMittal Temirtau was a Kazakh steel and mining company in Temirtau that ran Kazakhstan's largest steel plant and eight coal mines until the state took it over in 2023.
ArcelorMittal Zenica
ArcelorMittal Zenica is an integrated steel plant in Zenica, Bosnia and Herzegovina, built on the Iron and Steel Works Zenica founded in 1892 and sold by ArcelorMittal in 2025.
ARCEP
ARCEP, the Autorité de régulation des communications électroniques, is France's independent regulator for electronic communications, postal services, and press distribution. Created in 1997, it opened telecoms to competition.
Arcesilaus (Ἀρκεσίλαος)
Arcesilaus (Ἀρκεσίλαος, 315/4–241/40 BCE), Pitane-born fifth head of Plato's Academy, founded the skeptical New Academy, attacking Stoic epistemology and defending akatalêpsia and epochê.
Arcestes
Arcestes Suess 1865 is an extinct genus of smooth, globose ceratitid ammonoids (family Arcestidae) from Triassic marine strata, cosmopolitan from the Anisian to the Rhaetian, with a closed umbilicus and ammonitic suture.
Arceus (アルセウス)
Arceus (アルセウス) is the Mythical, Normal-type Pokémon #493 of Sinnoh lore, said to have emerged from an egg and shaped the world, with the Multitype ability that changes its type via held Plates; it headlined the 2009 film and the 2022 game Pokémon Legends: Arceus.
Arceuthobium
Arceuthobium (dwarf mistletoes), genus of hemi-parasitic flowering plants on conifers; 39 accepted species, conserved against Razoumofskya; explosive seed dispersal up to 16 m; major North American forest pathogen.
Arcfox Beta T1
The Arcfox Beta T1, originally the Arcfox T1, is a small battery-electric hatchback by BAIC's Arcfox brand, sold in China from 62,800 yuan against the BYD Dolphin.
ArcGIS
ArcGIS is a family of geographic information system software products developed by Esri since the 1980s, spanning desktop, server, cloud, and mobile tools, including ArcGIS Pro and ArcGIS Online.
ArcGIS Pro
ArcGIS Pro is Esri's full-featured professional desktop GIS application, released in 2015, used to create 2D maps and 3D scenes, analyze spatial data, and share work online.
Arch
An arch is a curved construction of wedge-shaped blocks, with a central keystone, that carries load in compression and underlies vaults, domes, and arch bridges.
Arch bridge
An arch bridge is a bridge whose main load-carrying element is an arch, a curved structure carrying load primarily in compression, and among the oldest bridge forms.
Arch Capital Group
Arch Capital Group Ltd. is a Bermuda-based insurer providing insurance, reinsurance, and mortgage insurance worldwide through subsidiaries, with about $26.9 billion in capital and S&P 500 membership.
ARCH Copenhagen (music)
ARCH is a nightclub in central Copenhagen, Denmark, opened in 2016 by the Danish producer Remee at Nørregade 41, playing hip-hop, house, and commercial electronic music.
Arch dam
An arch dam is a concrete dam curved in plan so water pressure is carried as arch thrust into the canyon walls, using far less concrete than a gravity dam.
Arch Enemy
Arch Enemy: Swedish melodic death metal band from Halmstad, formed 1995 by ex-Carcass guitarist Michael Amott. Debut Black Earth (1996); four vocalists, Johan Liiva, Angela Gossow, Alissa White-Gluz, Lauren Hart; 12th album Blood Dynasty (2025).
Arch Linux
Arch Linux is an independent, community-driven Linux distribution started by Judd Vinet in 2001, using a rolling release model, the pacman package manager, and the Arch User Repository.
Arch of Constantine
The Arch of Constantine (Arco di Costantino) is Rome's largest surviving triumphal arch, dedicated in 315 CE near the Colosseum for Constantine's victory over Maxentius at the Milvian Bridge, built largely of spolia from Trajanic, Hadrianic, and Antonine monuments.
Arch of Titus
Arch of Titus (Arco di Tito, Arcus Titi): first-century Pentelic marble honorific arch on the Via Sacra, Rome, built by Domitian after 81 CE for the deified Titus, with menorah spoils and triumph reliefs.
Arch Resources
Arch Resources was an American coal mining company formed in 1997, headquartered in St. Louis; it merged with CONSOL Energy in 2025 to form Core Natural Resources.
ARCH Venture Fund X Overage, L.P.
ARCH Venture Fund X Overage, L.P. is a Chicago-based venture capital sidecar fund of ARCH Venture Partners' tenth flagship fund, which raised $635.75 million for early-stage biotechnology investments.
ARCH Venture Partners
ARCH Venture Partners is a Chicago-based venture capital firm that co-founds early-stage biotech companies with scientists, managing about $12 billion and closing a $3 billion fund in 2024.