All articles starting with O

Oriented core

An oriented core is a cylindrical rock sample recovered by drilling whose original in situ position has been determined, typically by marking the core and measuring the mark's azimuth against geographic north.

Oriented matroid

An oriented matroid is a combinatorial structure recording the plus, minus, and zero sign patterns of finite point, vector, or hyperplane configurations, generalizing graphs, polytopes, and linear programming.

Oriented strand board

Oriented strand board (OSB) is an engineered wood structural panel made of cross-oriented layers of strands bonded under heat and pressure, widely used in North American home construction as a plywood alternative.

Orienteering

Orienteering (foot orienteering, FootO) is an endurance racing sport where competitors navigate with map and compass to control points, no marked route; disciplines include SkiO, MTBO, TrailO; IOF-governed, Olympic-recognized 1977.

Orienteering at the World Games

Orienteering at the World Games: foot orienteering (Middle, Sprint, Sprint Relay) within the IWGA's The World Games, held since Akita 2001 through Chengdu 2025; Switzerland leads the medal table, Simona Aebersold the top athlete.

Orienteering World Cup

Orienteering World Cup: the IOF's elite foot-orienteering series since 1986, annual since 2005, with sprint, middle, long, relay and knock-out sprint rounds; 2026 champions Simona Aebersold and Kasper Fosser.

Orientia

Orientia, a genus of obligate intracellular Rickettsiaceae bacteria transmitted by chigger mites; type species O. tsutsugamushi causes scrub typhus, with Candidatus O. chuto and O. chiloensis beyond the tsutsugamushi triangle.

Orientia tsutsugamushi

Orientia tsutsugamushi (formerly Rickettsia tsutsugamushi) is a gram-negative obligate intracellular bacterium causing scrub typhus, transmitted by chigger mites, with about 1 million annual cases, no vaccine, and doxycycline treatment.

Orifice metering

Orifice metering measures fluid flow by placing a plate with a precise hole in a pipe and inferring flow rate from the pressure drop across it.

Orifice plate

An orifice plate, or orifice meter, is a flat plate with a sharp-edged bore clamped in a pipe to measure flow rate from the pressure drop it creates.

Oriflamme

Oriflamme: red silk battle banner of the Abbey of Saint-Denis, adopted by the kings of France from Louis VI in 1124 until Agincourt (1415); also called orie flambe, aurea flamma.

Origa

Origa (オリガ), born Olga Vitalevna Yakovleva (1970-2015), was a Russian singer active in Japan, vocalist for Ghost in the Shell: Stand Alone Complex's opening themes with Yoko Kanno; debut album ORIGA (1994).

Origami (折り紙)

Origami (折り紙), Japanese paper folding from oru (fold) and kami (paper), evolved from ceremonial origata into an international art and a research field in mathematics, engineering, and education, with notation from Yoshizawa and applications from space structures to metamaterials.

Oct 22, 2026

Origami and kirigami mechanical metamaterials

Origami and kirigami mechanical metamaterials are architected materials in which folding or cutting a thin sheet creates 3D structures with tunable properties, used in robotics, medical devices, and aerospace.

Origami fabrication

Origami fabrication is a manufacturing approach that produces 3D structures, mechanisms, and robots by folding thin sheets along designed crease patterns, with applications from robotics to medical devices.

Origami mechanical metamaterial

An origami mechanical metamaterial is an architected material whose mechanical properties arise from fold patterns in a flat sheet, making properties programmable through geometry alone.

Origami soft robotic arm

An origami soft robotic arm is a lightweight robot manipulator built from folded crease patterns such as Kresling and Miura-ori, actuated by pneumatics, tendons, or both.

Origami-inspired soft robots

Origami-inspired soft robots are robots whose bodies are created by folding flat sheets into three-dimensional structures, pairing the adaptability of soft robotics with the strength of rigid panels.

Origanum

Origanum is a Lamiaceae genus of about 40-44 aromatic species native from Macaronesia and Europe to Central China, 90% Mediterranean. Includes oregano (O. vulgare, cymyl/carvacrol chemotype) and sweet marjoram (O. majorana, sabinyl chemotype).

Origen (Ὠριγένης)

Origen (Ὠριγένης), also known as Origen of Alexandria, was an early Christian theologian and biblical scholar who taught in Alexandria and Caesarea and compiled the Hexapla.

Orígens UNESCO Global Geopark

Orígens UNESCO Global Geopark (Conca de Tremp-Montsec), designated 2018, is a 2,050 km² geopark in Lleida, Catalonia, Spain, with over 500 million years of Pyrenean geological history and Europe's main dinosaur egg site.

Origin (Brown novel)

Origin (2017) is Dan Brown's fifth Robert Langdon thriller, set in Bilbao, Barcelona, Madrid, and Seville, following Langdon and Ambra Vidal as they unlock Edmond Kirsch's discovery, guarded by the AI Winston.

Origin (comics)

Origin (comics), also known as Wolverine: The Origin, is a Marvel series by Paul Jenkins. It reveals James Howlett, whose powers manifest after his father is murdered.

Origin (film)

Origin (2023) is Ava DuVernay's drama, also called a Caste adaptation, dramatizing Isabel Wilkerson writing her book while grieving; premiered at Venice 2023, released by Neon, starring Aunjanue Ellis-Taylor.

Origin (TV series)

Origin is a 2018 British sci-fi horror series created by Mika Watkins for YouTube Premium, starring Natalia Tena, Tom Felton, and Sen Mitsuji as colonists stranded on a damaged ship bound for the planet Thea.

Origin and function of meiosis

Origin and function of meiosis: meiosis evolved from mitosis in early eukaryotes, was present in the LECA, uses archaeal-derived Spo11 machinery, and functions in DNA restoration, disjunction, and recombination.

Origin Bio (Yuanqi Shengwu)

Origin Bio, known internationally as Oricell Therapeutics and in China as 原启生物, is a Chinese cell-therapy company founded in 2015 in Shanghai, developing CAR-T therapies for cancers.

Oct 10, 2026

Origin Energy

Origin Energy is an Australian integrated energy company that retails electricity, gas, and LPG to 4.9 million customers and holds 27.5 percent of Australia Pacific LNG.

Origin Materials

Origin Materials is an American sustainable-materials company in West Sacramento, California, founded in 2008 to convert cellulosic biomass into the chemical CMF, later pivoting to recyclable PET bottle caps.