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Oscar-class submarine
The Oscar-class submarine is a Soviet and Russian nuclear-powered cruise missile submarine class, known in Russia as Project 949 Granit and built to attack aircraft carrier groups.
OSCE (certification)
OSCE (Offensive Security Certified Expert) was an advanced OffSec penetration testing certification requiring a 48-hour hands-on exam; retired in 2020, it was replaced by OSCE³, granted with OSEP, OSWE, and OSED.
Oscillating water column
An oscillating water column (OWC) is a wave energy converter in which waves compress air in a chamber, driving a turbine and generator to produce electricity.
OSCP
The OSCP (OffSec Certified Professional) is a hands-on penetration-testing certification from OffSec, earned by hacking live machines in a proctored practical exam and documenting the attacks in a report.
Osculating orbit
An osculating orbit is the Keplerian ellipse or hyperbola a body would follow at a given instant if perturbing forces stopped, sharing the body's actual position and velocity.
Oseberg
Oseberg is a Norwegian North Sea oil and gas field around 130 km northwest of Bergen, discovered in 1979, producing since 1988, and operated by Equinor.
Oseberg Oil and Gas Field
Oseberg is a producing oil and gas field in the northern Norwegian North Sea, discovered in 1979 and producing since 1988, operated by Equinor from the Oseberg Field Centre.
Oseberg Ship burial
The Oseberg ship burial is a Viking Age grave mound near Tønsberg, Norway, where a decorated oak ship built around 820 served as the burial place of two women in 834.
OSFP (optical transceiver)
OSFP (Octal Small Form Factor Pluggable) is a pluggable optical transceiver form factor defined by the OSFP MSA for 400 Gbps, 800 Gbps, and 1.6 Tbps Ethernet links.
OSG Corporation
OSG Corporation is a Japanese cutting tool manufacturer headquartered in Toyokawa, Aichi, founded in Tokyo in 1938 by Hideo Osawa, with a network spanning 33 countries.
Osgoode Hall
Osgoode Hall is a historic legal complex at Queen Street West in Toronto, home to Ontario's superior courts since 1846 and the Law Society of Ontario since 1832.
Oshi Oil and Gas Field
The Oshi Oil and Gas Field is an onshore oil and gas field in the northern Niger Delta of Nigeria, operated by the Nigerian Agip Oil Company joint venture.
Oshkosh Corporation
Oshkosh Corporation, formerly Oshkosh Truck Corporation, is an American industrial company in Oshkosh, Wisconsin, founded in 1917, that makes military trucks, fire apparatus, and aerial work platforms.
Oshkosh L-ATV
The Oshkosh L-ATV is a light military vehicle built in Wisconsin that won the Army and Marine Corps' 2015 Joint Light Tactical Vehicle program to replace the Humvee.
Oshkosh M-ATV
The Oshkosh M-ATV (MRAP All-Terrain Vehicle) is a mine-resistant, ambush-protected armored vehicle built by Oshkosh Corporation for the US Department of Defense, fielded in Afghanistan from 2009.
Oshkosh M1070
The Oshkosh M1070 is an 8x8 military truck tractor built by Oshkosh Defense since 1992 to haul the M1 Abrams tank for the U.S. Army.
Oshskoye Oil Field
Oshskoye Oil Field (Ошское) is an oil field in Russia's Timan-Pechora province, developed by LUKOIL-Komi since 2012 and known for a 2021 pipeline spill into the Kolva River.
OSI model
The OSI model, also called the Open Systems Interconnection Reference Model, is a seven-layer framework dividing network communication into layers from physical media to applications.
OSI protocol suite
The OSI protocol suite, built around the seven-layer OSI Reference Model published in 1984, was the principal rival to TCP/IP in the 1980s Protocol Wars.
Osian temples
The Osian temples are a group of Hindu and Jain temples at Osian, near Jodhpur in Rajasthan, built between the 8th and 12th centuries and called the Khajuraho of Rajasthan.
OSIRIS-APEX
OSIRIS-APEX is a NASA asteroid mission using the former OSIRIS-REx spacecraft to study changes to Apophis caused by its close Earth approach in April 2029.
OSIRIS-REx
OSIRIS-REx, also called the Osiris mission, was a NASA New Frontiers spacecraft that collected rocks from asteroid Bennu and returned them to Earth in 2023.
Oskarshamn nuclear power plant
Oskarshamn nuclear power plant (Oskarshamns kärnkraftverk) is a Swedish nuclear power station on the Simpevarp peninsula in the Baltic Sea, whose reactor O1 was Sweden's first commercial nuclear reactor.
Oslo Airport, Gardermoen
Oslo Airport, Gardermoen, also known as Oslo lufthavn, Gardermoen, is Norway's main international airport, serving Oslo and Eastern Norway. Opened in 1998, it handled 27.1 million passengers in 2025.
Oslofjord Tunnel
The Oslofjord Tunnel (Oslofjordtunnelen) is a 7,306-meter subsea road tunnel on European route E134 under the Oslofjord in Norway, opened in 2000 as part of the Oslofjord Connection.
Osman M. Bakr
Osman M. Bakr is a Saudi materials scientist and professor at KAUST in Saudi Arabia, known for perovskite single crystals for solar cells and radiation detection.
Oso Oil and Gas Field
The Oso Oil and Gas Field is a giant offshore gas condensate field about 12 miles off southeastern Nigeria, discovered in 1967 and producing since 1992.
OSPAR Pipeline
The OSPAR Pipeline (Oleoduto Santa Catarina–Paraná) is a 117 km Brazilian crude oil pipeline running from the São Francisco do Sul terminal to the Repar refinery in Paraná.
Ospedale degli Innocenti
The Ospedale degli Innocenti, or Hospital of the Innocents, is a former foundling hospital in Florence, Italy, begun in 1419 to a design by Filippo Brunelleschi.
Osram
Osram is a German lighting brand registered as a lamp trademark in 1906, spun off from Siemens in 2013, and taken over by the Austrian sensor maker ams in 2020.