All articles starting with O
9,097 articles
Onitsha Kingdom
The Onitsha Kingdom is a traditional Igbo monarchy in Anambra State, Nigeria, ruled by a king called the Obi with a council of chiefs, the Ndichie.
Onitsha Market Literature
Onitsha Market Literature is the inexpensive pamphlet literature, mostly in English, written and sold at Onitsha Market in southeastern Nigeria from the late 1940s until the market's destruction in 1968.
Onitsuka Tiger
Onitsuka Tiger (オニツカタイガー) is a Japanese footwear and fashion brand founded in Kobe in 1949 by Kihachiro Onitsuka; its company became ASICS in 1977, and the brand was revived as a fashion label in 2002 with the Mexico 66.
Oniwaban
The Oniwaban (御庭番, "garden guards") was a corps of secret agents and inspectors of the Tokugawa shogunate in Edo-period Japan, created by the eighth shogun, Tokugawa Yoshimune, in 1716.
Onjo of Baekje
Onjo (온조) is recorded as the legendary founder and first king of Baekje, one of the Three Kingdoms of Korea, reigning from 18 BC to AD 28.
Onjō-ji (Mii-dera)
Onjō-ji (園城寺), commonly known as Mii-dera, is a Buddhist temple in Ōtsu, Shiga Prefecture, Japan, and the head temple of the Tendai Jimon branch of the Tendai school.
Onkalo spent nuclear fuel repository
Onkalo, Posiva Oy's spent nuclear fuel repository on Finland's Olkiluoto island, is set to become the world's first permanent disposal facility, about 430 meters underground.
Onkar Bhojane (ओंकार भोजणे)
Onkar Bhojane (ओंकार भोजणे) is a Marathi actor and comedian born in 1992 in Chiplun, Maharashtra, known for Maharashtrachi Hasyajatra and films including Boyz 2 and Girlz.
Onkar Raut (ओंकार राऊत)
Onkar Raut (ओंकार राऊत) is an Indian actor working in Marathi film, television, and theater since 2014, known for Timepass, Freshers, and Maharashtrachi Hasyajatra, and appearing in the 2025 Netflix film Inspector Zende.
OnKure Therapeutics
OnKure Therapeutics is a Boulder, Colorado-based clinical-stage biopharmaceutical company developing small-molecule precision medicines targeting mutated PI3Kα for cancers and vascular anomalies; formed in 2024, its lead candidate is OKI-219.
ONL Therapeutics
ONL Therapeutics is a clinical-stage biotechnology company in Ann Arbor, Michigan, developing therapies to protect retinal cells from Fas-mediated cell death in blinding retinal diseases; its lead candidate is xelafaslatide.
Onlay mesh repair
Onlay mesh repair is a ventral hernia repair technique in which prosthetic mesh is placed over the closed abdominal wall fascia, reinforcing a tension-free primary closure.
Online advertising
Online advertising, also known as online marketing or web advertising, sells promotional messages through digital channels, with global revenue projected at $1.08 trillion in 2025.
Online age verification laws by country
Online age verification laws by country: statutes requiring age checks for social media, adult content, and app stores. Covers the UK Online Safety Act, Australia's under-16 ban, the EU blueprint, and US state laws, with adoption, enforcement, and privacy criticism.
Online algorithm
An online algorithm, also known as online computation, is an algorithm that must decide as input arrives piece by piece, without knowledge of future input, unlike an offline algorithm.
Online analytical processing
Online analytical processing (OLAP), a database technology named by E.F. Codd in 1993, organizes business data into multidimensional cubes supporting operations such as drill-down and slice.
Online and offline
"Online and offline" (Online & offline) describe whether a device, app, or person is connected to a network, most commonly the internet, with meanings that differ at the device, application, and service levels.
Online banking
Online banking, also called internet banking, is the use of a bank's website or mobile app to view accounts and make transactions without visiting a branch.
Online casino
Online casino: internet-based gambling sites offering roulette, blackjack, slots, poker, and bingo via random number generators. Began with ICI in 1995; regulated nationally, taxed (UK Remote Gaming Duty 40% from 2026), legal in seven US states.
Online Certificate Status Protocol
The Online Certificate Status Protocol (OCSP) is an Internet protocol, specified in RFC 6960, for checking the revocation status of an X.509 digital certificate in real time.
Online chat
Online chat, also known as webchat or Internet chat, is real-time text-based conversation over the Internet, spanning instant messaging, multi-user chat rooms, and commercial live chat.
Online community
Online community: groups interacting regularly around shared purpose in online spaces. Known for BBS and Usenet origins (1978 onward), volunteer moderation, rules raising participation 70% in r/science.
Online consultation
Online consultation covers e-consultation, where governments gather citizen input via web platforms, and remote clinical consultation by phone or video. Key issues: structuring versus participation, digital divide barriers, unequal uptake, and whether input shapes decisions.
Online continual learning
Online continual learning (OCL) is a machine learning setting in which a model learns from a continuous data stream in a single pass, retaining old tasks using a small replay buffer.
Online coverage path planning
Online coverage path planning is the problem of computing, while a robot moves, a path covering every point of an environment whose layout is not known in advance.
Online deliberation
Online deliberation is structured citizen discussion of public issues via digital platforms, studied against face-to-face deliberation; evidence covers civic effects, participant differences, moderation, and institutional uses like the Conference on the Future of Europe.
Online encyclopedia
An online encyclopedia is a reference work offering alphabetically organized summaries of knowledge over the internet, ranging from volunteer-written Wikipedia to subscription products like Encyclopaedia Britannica Online.
Online focus groups
An online focus group is a qualitative research method in which a moderated group discussion is conducted over the internet, either in real time or asynchronously on discussion boards.
Online food ordering
Online food ordering: customers order food via websites, apps, QR-code menus, kiosks, or delivery platforms like Meituan and Ele.me. Covers channels, 15–30% platform commissions, consumer cost premiums, and adoption data.
Online gambling
Online gambling (internet or remote gambling): betting via websites and apps on sports, casino games, poker, and lotteries. Grew from 15 sites in 1996 to a multi-billion-dollar industry; regulated nationally, with UIGEA in the US and licensing regimes in the UK and EU.