All articles starting with O
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Okamura Yasuji
Okamura Yasuji (岡村寧次) was an Imperial Japanese Army general who commanded Japanese forces in China in the Second Sino-Japanese War and signed Japan's surrender at Nanjing in 1945.
Okanagan
The Okanagan is a semi-arid valley and lake basin in southern interior British Columbia, home to the Syilx people, irrigated orchards and vineyards, and a wine industry worth $3.75 billion annually.
Okap
Okap, the Haitian Creole name for Cap-Haïtien, is Haiti's second largest city and capital of the Nord department. Founded 1670, a former colonial and royal capital, port and tourist hub.
Okapi
Okapi (Okapia johnstoni), a striped, short-necked forest giraffid endemic to the Congo basin rainforests, discovered by Western science in 1900 via Harry Johnston and Indigenous guides; IUCN Endangered, about 30,000 remain.
Okapi BM25
Okapi BM25, often shortened to BM25, is a ranking function that scores how well a document matches a query, and is the default in Elasticsearch and Lucene.
Okapi Wildlife Reserve
Okapi Wildlife Reserve (Réserve de faune à okapis): ~13,726 km² protected area in the Ituri forest, DRC, created 1992, UNESCO World Heritage Site 1996, in Danger since 1997; holds about 5,000 of 30,000 wild okapi, 17 primate species, and Mbuti and Efe communities; threatened by poaching and gold mining.
Okara
Okara (اوکاڑہ) is a city and district headquarters in Punjab, Pakistan, named after the Okaan tree; a British canal-colonization town, tehsil HQ 1918, district HQ since 1 July 1982, agricultural and dairy economy.
Okāra District
Okara District (ضلع اوکاڑہ) is a district of Punjab, Pakistan, created 1 July 1982 from Sahiwal District, with tehsils Okara, Depalpur, and Renala Khurd; population 3,515,490 (2023 census), agriculture-based economy on the Lower Bari Doab Canal.
Okarem-Beyneu Gas Pipeline
The Okarem-Beyneu Gas Pipeline (Russian: Газопровод Окарем-Бейнеу) is a natural gas pipeline from Okarem, Turkmenistan, to Beyneu, Kazakhstan, built in the 1970s to carry Soviet gas westward.
Okarun (オカルン)
Okarun (オカルン), real name Ken Takakura (高倉 健), is the male lead of Yukinobu Tatsu's manga Dandadan (Shonen Jump+, from April 2021): an alien-believing occult fan cursed by Turbo Granny, gaining 100 km/h speed with a two-use limit, later wielding the Oni club.
Okavango (river, Botswana)
The Okavango River, called the Cubango in Angola, is a southwestern African river about 1,600 km long that rises on the Bie Plateau and ends in Botswana's inland Okavango Delta.
Okavango Delta
Okavango Delta System: endorheic inland delta (alluvial fan) in north-western Botswana, fed by Angola's Okavango River; Ramsar site 1996, UNESCO World Heritage Site 2014; Africa's largest endorheic delta.
Okavango Valles
Okavango Valles is a system of Martian outflow channels in the Ismenius Lacus quadrangle, over 400 km long, named for Botswana's Okavango River and IAU-approved in 2012; fan deltas indicate ancient fluvial discharge.
Ōkawa Shūmei
Ōkawa Shūmei (大川周明, December 6, 1886 – December 24, 1957) was a Japanese ultranationalist political theorist and pan-Asianist ideologue whose writings inspired many right-wing extremist groups that dominated Japanese politics in the 1930s.
Okay! Madam (오케이 마담)
Okay! Madam (오케이 마담) is a 2020 South Korean action comedy directed by Lee Cheol-ha, starring Uhm Jung-hwa and Park Sung-woong as a couple whose first Hawaii flight is hijacked; it drew 1,229,372 admissions and spawned a 2026 cruise-set sequel.
Okay! Madam 2
Okay! Madam 2 (오케이 마담2, OK! MADAM: BON VOYAGE) is a 2026 South Korean comic action film directed by Lee Cheol-ha, sequel to Okay! Madam (2020), starring Uhm Jung-hwa, Park Sung-woong, and Choi Sooyoung as villain Anya in a cruise-ship hijack plot.
Okayama (city)
Okayama (岡山市), capital of Okayama Prefecture in western Japan; ordinance-designated city since 2009 with four wards, about 708,000 residents (2025), Okayama Castle, Korakuen Garden, and a major Shinkansen transport hub.
Okayama (venue)
Okayama International Circuit (岡山国際サーキット), formerly TI Circuit Aida, is a 3.703 km, 13-corner FIA Grade 2 road course in Mimasaka, Japan, opened 1990, host of the 1994-95 Pacific Grand Prix and today Super GT and motorcycle races.
Okayama-ken
Okayama-ken (岡山県), Okayama Prefecture, is a prefecture in western Japan's Chugoku region on the Seto Inland Sea, established 18 April 1876, capital Okayama City, about 1.8 million people, known for Korakuen Garden, Kurashiki, and Kojima denim.
OkayJake
OkayJake is the stage name of Jake Friant, an American experimental bass and dubstep producer from Atlanta, Georgia, formerly known as Kick, whose debut EP Metal Flower came in 2022.
Okazaki
Okazaki (岡崎市) is a city in central Aichi Prefecture, Japan, about 35 km east of Nagoya, birthplace of Tokugawa Ieyasu at Okazaki Castle in 1542; population about 380,000, city status 1916, area 387.24 km2.
Okazaki fragments
Okazaki fragments are short lagging-strand DNA pieces made discontinuously at replication forks, 1,000–2,000 nt in bacteria and 100–200 nt in eukaryotes, discovered by the Okazakis and joined after primer removal by FEN1 and ligase.
Okcheon Nongshim Themed Park
Okcheon Nongshim Themed Park (농심테마공원), a free 32,000 m² agricultural experience park in the Okcheon Agricultural Technology Center, North Chungcheong, linked by walkway to the Gyeongbu Expressway rest area.
OkCredit
OkCredit is a Bengaluru-based fintech startup founded in 2017 whose free digital ledger app lets Indian small merchants record credit sales and payments in place of a paper bahi khata register.
OkCupid
OkCupid, formerly SparkMatch, is a dating website and mobile app launched in 2004 by four Harvard students, matching users through compatibility percentages from thousands of answered questions.
Oke Oka Jeevitham (ఒకే ఒక జీవితం)
Oke Oka Jeevitham (ఒకే ఒక జీవితం), Tamil Kanam, is a 2022 Telugu sci-fi drama, Shree Karthick's debut, starring Sharwanand, Ritu Varma, and Amala Akkineni; a time-travel story about a musician and friends revisiting 1998, a Dream Warrior Pictures hit.
OKE Surfboards
Oke Surfboards, Australian family surfboard manufacturer founded 1968 by Alan Oke in Edithvale, Melbourne; run by Neil "Chok" Oke and sons Dan and Rory from Braeside, VIC; distinct from OKE Group, OKE Gear, and ONEOK.
Okean Elzy
Okean Elzy (Океан Ельзи) is a Ukrainian rock band formed in Lviv in 1994 and fronted by Svyatoslav Vakarchuk, the country's most famous and successful band.
Okeechobee Clean energy center
The Okeechobee Clean Energy Center (OCEC) is a 1,723 MW natural gas-fired combined-cycle power plant in Okeechobee County, Florida, operated by Florida Power & Light since 2019.
Okeechobee Music & Arts Festival
The Okeechobee Music & Arts Festival is a multi-genre music and arts camping festival held at Sunshine Grove in Okeechobee County, Florida, first staged in March 2016.