All articles starting with O
9,097 articles
Opel GT
The Opel GT is a two-seat sports coupé built by German automaker Opel from 1968 to 1973, with a Coke-bottle-shaped body, pop-up headlights, and Kadett-based mechanicals.
Opel Insignia
The Opel Insignia, sold as the Vauxhall Insignia in the UK, is a large family car built by German manufacturer Opel from 2008 to 2022, succeeding the Vectra.
Opel Kadett
The Opel Kadett is a compact automobile model produced by German manufacturer Opel from 1936 to 1991, serving as the compact mainstay before continuing as the Opel Astra after 1991.
Opel Kadett E
The Opel Kadett E is a compact car built by Opel from 1984 to 1991, the fifth and last Kadett before the line became the Astra.
Opel Manta
The Opel Manta is a rear-wheel-drive sports coupé built by the German automaker Opel in two generations from 1970 to 1988 as a European rival to the Ford Capri.
Opel Meriva
The Opel Meriva, sold in the UK as the Vauxhall Meriva, is a compact minivan built by Opel from 2003 to 2017, known for its flexible rear seating.
Opel Mokka
The Opel Mokka, sold as the Vauxhall Mokka in the United Kingdom, is a German subcompact crossover SUV produced since 2012, with a fully redesigned second generation launched in 2021.
Opel Omega
The Opel Omega, also sold as the Vauxhall Omega, was an executive sedan built by Opel in Germany from 1986 to 2003 in two generations.
Opel Senator
The Opel Senator, sold in Britain as the Vauxhall Royale and Vauxhall Senator, was Opel's flagship executive saloon, built from 1978 to 1993 in two generations.
Opel Sintra
The Opel Sintra, sold as the Vauxhall Sintra in the United Kingdom, was a full-size MPV sold by Opel from 1997 to 1999, derived from an American minivan design.
Opel Tigra
The Opel Tigra, sold as the Vauxhall and Holden Tigra, is a small sports coupé from German automaker Opel, launched in 1994 on the Corsa B platform.
Opel Vectra
The Opel Vectra, sold as the Vauxhall, Holden, and Chevrolet Vectra, is a mid-size family car built by Opel from 1988 to 2008 through three generations.
Opel Zafira
The Opel Zafira, sold in the UK as the Vauxhall Zafira, is a compact MPV built by German manufacturer Opel and first shown in 1999 as the first seven-seat compact van.
Open (main beam) tunnel boring machine
An open (main beam) tunnel boring machine, or gripper TBM, is a shieldless hard-rock machine that advances by gripping the tunnel walls as its thrust base.
Open Abdomen Techniques
Open abdomen techniques: temporary abdominal closure methods (NPWT, Bogota bag, Wittmann patch, fascial traction) used after laparostomy in damage control surgery and sepsis; early fascial closure preferred, evidence of superiority limited.
Open access
Open access (OA): scholarly publishing model making research free online with reuse rights, defined by the Budapest Open Access Initiative (2002) and Berlin Declaration (2003). Routes include gold, green, bronze, hybrid, and diamond OA, funded by article processing charges or institutions.
Open access and open education movement in physics
The open access and open education movement in physics promotes freely readable research and openly licensed teaching materials, rooted in the 1991 founding of arXiv and OpenStax textbooks.
Open addressing
Open addressing, also called closed hashing, is a hash-table collision-resolution technique that stores all elements in the table's array, resolving collisions by probing for empty slots.
Open adoption
Open adoption is an arrangement in which biological parents have some contact with the child and the adoptive parents, now the most widespread form in the United States.
Open All Hours
Open All Hours is a BBC sitcom by Roy Clarke starring Ronnie Barker as miserly shopkeeper Arkwright with David Jason as nephew Granville; pilot in Seven of One (1973), four series 1976-1985, 8th in BBC's 2004 greatest-sitcom poll, sequel Still Open All Hours 2013-2023.
Open API
Open API refers to the OpenAPI Specification, a language-agnostic standard for describing HTTP APIs, renamed from Swagger after its 2015 donation to the Linux Foundation.
Open appendectomy
Open appendectomy is the removal of an inflamed appendix through a single incision in the right lower abdomen, typically at the McBurney point, now used when laparoscopy is unsuitable.
Open Arms (Journey song)
Open Arms is a 1981 Journey power ballad written by Steve Perry and Jonathan Cain, rejected by John Waite of The Babys before Journey recorded it for Escape; it peaked at Number 2 on the Billboard Hot 100 and was named VH-1's greatest power ballad.
Open Babel
Open Babel is an open-source cheminformatics toolkit, written in C++ and started in 2001, that converts chemical data between over 100 file formats and provides a library usable from Python and other languages.
Open ball
An open ball in a metric space is the set of all points within a given distance of a center, and it is always an open set.
Open banking
Open banking is a framework in which customers let regulated third parties read their account data and initiate payments through standardized APIs, adopted in 49 countries.
Open Bionics
Open Bionics is a British medical device company based in Bristol, founded in 2014 by Joel Gibbard and Samantha Payne, known for the Hero Arm, a 3D-printed myoelectric hand.
Open Blue Sea Farms (Open Blue Cobia)
Open Blue Sea Farms, selling under the Open Blue Cobia brand, is an American aquaculture company founded by Brian O'Hanlon that farmed cobia in offshore pens off Panama.
Open border
Open border: a border allowing free movement of people with little or no border control. Exists in practice via the Schengen area and similar zones; in philosophy, the position that states should not restrict immigration.
Open Cabildo of 22 May 1810
The Open Cabildo of 22 May 1810 (Cabildo Abierto del 22 de mayo de 1810) was a Buenos Aires meeting that voted to remove Viceroy Cisneros.