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O'Neill cylinder
The O'Neill cylinder is a proposed rotating space habitat, conceived by Princeton physicist Gerard K. O'Neill in 1969, in which people live on the inner surface of spinning cylinders.
O'Shaughnessy Dam (California)
O'Shaughnessy Dam, known as the Hetch Hetchy dam, is a 430-foot dam on the Tuolumne River in Yosemite National Park, built by San Francisco for its water supply.
o1 (OpenAI reasoning model)
o1 is a large language model released by OpenAI on September 12, 2024, the first in its reasoning-model line, trained to think through problems step by step.
O2 (UK)
O2, the consumer brand of Telefónica UK, is a British mobile network operator that launched in 2001 and joined the Virgin Media O2 joint venture in 2021.
o3
o3 is a reasoning model released by OpenAI, announced in December 2024 and shipped in April 2025, best known for scoring 87.5% on the ARC-AGI benchmark.
O3b Networks
O3b Networks, founded by Greg Wyler in 2007, was a satellite broadband company named for the "other 3 billion" without internet access, now fully owned by SES.
Oahe Dam
Oahe Dam is a large rolled-earth dam on the Missouri River north of Pierre, South Dakota, built by the U.S. Army Corps of Engineers and operating since 1962.
OAI-PMH
The Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH), released in 2001, lets repositories expose structured metadata over HTTP that harvesters collect through six requests.
Oak Alley Plantation
Oak Alley Plantation is a historic former sugar plantation in Vacherie, Louisiana, known for its Greek Revival mansion and its double row of 28 live oaks.
Oak Creek Power Plant
The Oak Creek Power Plant is a coal-fired power station in Oak Creek, Wisconsin, 20 miles south of Milwaukee, forming Wisconsin's largest coal-fired plant with the Elm Road Generating Station.
Oak Grove Plant
Oak Grove Plant, formally the Oak Grove Steam Electric Station, is a two-unit, lignite-fired power plant in Robertson County, Texas, owned and operated by Luminant, a subsidiary of Vistra Corp.
Oak Hill Solar Facility
The Oak Hill Solar Facility is a pair of community solar farms with battery storage in Duanesburg, New York, developed by Eden Renewables and owned by PureSky Energy.
Oak Ridge Leadership Computing Facility
The Oak Ridge Leadership Computing Facility is a Department of Energy supercomputing facility at Oak Ridge National Laboratory, home to Frontier, the first exascale supercomputer.
Oak Ridge National Laboratory
Oak Ridge National Laboratory (ORNL) in Oak Ridge, Tennessee, is the U.S. Department of Energy's largest science and energy laboratory, founded in 1943 as part of the Manhattan Project.
Oak Ridge Solar Farm
Oak Ridge Solar Farm is a 200 MW utility-scale solar power plant in northeastern Louisiana, developed by AES Clean Energy and opened in December 2023 as Louisiana's largest.
Oakland International Airport
Oakland International Airport, officially Oakland San Francisco Bay Airport since 2025, formerly Metropolitan Oakland International Airport, is the main East Bay airport in Oakland, California, opened in 1927.
Oakley, Inc.
Oakley, Inc. is an American sports and lifestyle eyewear brand founded by Jim Jannard in 1975, known for Prizm lenses and acquired by Luxottica in 2007 for $2.1 billion.
Oakville Assembly Plant
Oakville Assembly Plant is a Ford vehicle assembly plant in Oakville, Ontario, Canada. Opened in 1953, it is Ford's only Canadian assembly plant and is being converted to build Super Duty trucks.
Oaky Creek Coal Mine
Oaky Creek Coal is an underground metallurgical coal mine in Queensland's Bowen Basin, operated by Glencore and the first in Australia to fully automate its longwall.
Oando
Oando PLC is a Nigerian integrated energy group headquartered in Lagos, listed in Nigeria and Johannesburg, and operator of core Niger Delta oil and gas joint venture assets since 2024.
Oasis
Oasis is a real-time AI world model released by Decart and Etched in October 2024, generating a playable, Minecraft-style world frame-by-frame with no game engine.
Oasis of the Seas
Oasis of the Seas is a Royal Caribbean cruise ship that was the largest ever built at its 2009 debut and introduced the seven-neighborhood design.
Oasis Petroleum
Oasis Petroleum was an independent oil and gas exploration and production company founded in 2007 and headquartered in Houston, Texas, focused on the Williston Basin of North Dakota and Montana.
Oasis-class cruise ship
The Oasis class, also called the Genesis class, is a class of Royal Caribbean cruise ships whose lead ship, Oasis of the Seas, was the world's largest in 2009.
Oast house
An oast house, also called a hop kiln, is an English farm building used for drying hops before they are sent to breweries, common in Kent and Sussex.
OAuth
OAuth, or Open Authorization, is an open standard for delegated authorization published by the IETF, with version 1.0 standardized in 2010 and OAuth 2.0 in 2012.
OAuth 2.0
OAuth 2.0 is an IETF authorization framework, standardized in RFC 6749 in 2012, that lets third-party applications obtain limited access to an HTTP service without user credentials.
Obaiyed gas field
The Obaiyed gas field is a tight gas and condensate field in the Shushan Basin of Egypt's northern Western Desert, discovered by Shell in 1992 and producing since 1999.
Obaiyed-Amreya Northern Gas Pipeline
The Obaiyed-Amreya Northern Gas Pipeline, also called the Northern Gas Pipeline, carries natural gas about 400 km across Egypt to the national grid near Alexandria.
OBBTree
OBBTree is a hierarchical data structure for rapid collision detection between complex polygonal models, built from tightly fitting oriented bounding boxes and presented at SIGGRAPH in 1996.