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52-474: [REDACTED] Look up O₂ in Wiktionary, the free dictionary. O2 , O-2 , o2 , O 2 , O , O or O may refer to: Science and technology [ edit ] For vehicles, see § Vehicles . O 2 or dioxygen , the common allotrope of the chemical element oxygen O , the ion oxide O − 2 , the ion superoxide O + 2 ,

104-585: A 60:40 venture between British Telecommunications (British Telecom or BT) and Securicor respectively. In 1999  ( 1999 ) , BT purchased Securicor's shares in Cellnet for £3.15 billion. The company was later rebranded as BT Cellnet, and it became a part of BT Wireless , a group of subsidiary companies owned by BT. BT invested £2 billion in BT Cellnet, and in 2000  ( 2000 ) , BT Cellnet had over 6 million customers. In October 2001  ( 2001-10 ) , at

156-405: A chain of music venues O2 Wireless USA or H2O Wireless, a prepaid wireless service by Locus Telecommunications O2TV , a Russian independent socially political TV channel Vehicles and vessels [ edit ] Cessna O-2 Skymaster , a military twin-engine light aircraft Douglas O-2 , a military single-engine observation biplane O 2 -class submarine , a class of submarines of

208-465: A collection of worldwide telecommunications companies, known in the later half of the 1990s as BT Wireless, and a global mobile data business known then as Genie Internet, both subsidiaries of British Telecommunications (British Telecom or BT). As part of a reorganisation of Telefónica in 2014, Telefónica Europe's holdings and operations became direct subsidiaries of its parent: Telefónica S.A. Telefónica Europe provided mobile telephony operations in

260-405: A deeper blue color than ordinary O 2 , and they are unstable and explosive. In its gas phase, ozone is destructive to materials like rubber and fabric and is damaging to lung tissue. Traces of it can be detected as a pungent, chlorine-like smell, coming from electric motors , laser printers , and photocopiers , as it is formed whenever air is subjected to an electrical discharge. It

312-649: A general meeting held in Birmingham , 4.297 billion BT shares voted in favour of BT Cellnet's demerger from BT, with 0.67 million shares voting against. In 2001, BT Cellnet demerged from BT as mmO2 plc , and was relaunched on 1 May 2002 using the O2 brand. The company changed its name from mmO2 to O2 plc in March 2005. In 2021 it merged with Virgin Media to form Virgin Media O2 . Digifone

364-601: A management buyout in 2007. O2 Asia, headquartered in Singapore , operating in Far East , South Asia , Middle East, and Australasian countries, for a short time developed and marketed a range of wirelessly connected PDA and smartphone products branded Xda for both the Asian and European markets, and further such products under the "MWg" brand, short for Mobile & Wireless Group. In 2015 there were talks for Li Ka-shing , owner of

416-1321: A part of the Jumeirah Lake Towers in Dubai, United Arab Emirates O2 World (Berlin) , an indoor arena in Berlin, Germany O2 World (Hamburg) , an indoor arena in Hamburg, Germany Otoyol 2 , a motorway in Turkey called "O2" The O2 (Dublin) , the former name of 3Arena Ring 2 (Aarhus) , a road in Aarhus, Denmark, which appears as "O2" on signs Ring 2 (Copenhagen) , a road in Copenhagen, Denmark, which appears as "O2" on signs Arts, entertainment, and media [ edit ] Film [ edit ] Oxygen (2021 film) or O2 , an American-French survival thriller film in production O2 (2020 film) , an Estonian-Latvia-Lithuanian-Finnish historical spy thriller film O2 (2022 film) , an Indian Tamil language survival thriller film O2 (2024 film) , an Indian Kannada language medical thriller film Music [ edit ] Albums [ edit ] O 2 (FireHouse album) (2000) album of

468-446: A photosensitized process by energy transfer from dye molecules such as rose bengal , methylene blue or porphyrins , or by chemical processes such as spontaneous decomposition of hydrogen trioxide in water or the reaction of hydrogen peroxide with hypochlorite . Triatomic oxygen (ozone, O 3 ) is a very reactive allotrope of oxygen that is a pale blue gas at standard temperature and pressure . Liquid and solid O 3 have

520-713: A song by Suho from Self-Portrait Other arts, entertainment, and media [ edit ] Ö2 , a radio service for Austria and South Tyrol O2, a character in Kirby 64: The Crystal Shards Businesses and organisations [ edit ] O 2 , trading name for Telefónica Europe , a European telecommunications provider O2 Store , a chain of retail stores owned and operated by Telefónica Europe, with regional subsidiaries: O2 (brand) , Telefónica mobile network global brand name O2 (Ireland) , merged into Three Ireland O2 (UK) O2 Czech Republic Telefónica Germany Telefónica Slovakia O2 Academy ,

572-406: A subsidiary of mmO2 plc. On 4 June 2010, Manx Telecom was sold to UK private equity investor HG Capital (who were buying the majority stake), alongside telecoms management company CPS Partners. HG Capital indicated that the enterprise value of the deal was £158.8 million ($ 232.5 million). Genie Internet Ltd and Genie Asia were created as autonomous but wholly owned subsidiaries of BT in 2000. By

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624-688: Is a dark-red O 8 cluster. When oxygen is subjected to a pressure of 96 GPa, it becomes metallic , in a similar manner to hydrogen , and becomes more similar to the heavier chalcogens , such as selenium (exhibiting a pink-red color in its elemental state), tellurium and polonium , both of which show significant metallic character. At very low temperatures, this phase also becomes superconducting . Nascent oxygen O Dioxygen ( singlet  and  triplet ) O 2 Trioxygen ( ozone  and  cyclic ozone ) O 3 Tetraoxygen O 4 Octaoxygen O 8 Telef%C3%B3nica Europe O2 (typeset as O 2 )

676-561: Is a global brand name owned by the Spanish telecommunications company Telefónica . The company uses the O2 brand for its subsidiaries in the United Kingdom and Germany. Since 2018, it is also used as an online-only flanker brand in Spain. Formerly, all European branches of Telefónica were managed by Telefónica Europe plc, a broadband and telecommunications company. The company originated as

728-446: Is an air pollutant that is especially harmful for senior citizens, children, and people with heart and lung conditions such as emphysema , bronchitis , and asthma . The immune system produces ozone as an antimicrobial (see below). Cyclic ozone is a theoretically predicted O 3 molecule in which its three atoms of oxygen bond in an equilateral triangle instead of an open angle. Tetraoxygen had been suspected to exist since

780-453: Is essential for life. With this, the company logo and associated graphics were designed, using air bubbles to present this. O2 currently sponsor the England rugby team , and in 2003 launched a mobile video service allowing customers to download or stream video content related to the 2003 Rugby World Cup . In 2005, Telefónica O2 extended their involvement in rugby union , signing a new deal with

832-546: Is most commonly encountered in the diatomic form. Aerobic organisms use atmospheric dioxygen as the terminal oxidant in cellular respiration in order to obtain chemical energy . The ground state of dioxygen is known as triplet oxygen , [O 2 ] , because it has two unpaired electrons. The first excited state, singlet oxygen , [O 2 ] , has no unpaired electrons and is metastable . The doublet state requires an odd number of electrons, and so cannot occur in dioxygen without gaining or losing electrons, such as in

884-567: Is pale blue in colour, and is quite markedly paramagnetic due to the unpaired electrons; liquid oxygen contained in a flask suspended by a string is attracted to a magnet. Singlet oxygen is the common name used for the two metastable states of molecular oxygen ( O 2 ) with higher energy than the ground state triplet oxygen . Because of the differences in their electron shells, singlet oxygen has different chemical and physical properties than triplet oxygen, including absorbing and emitting light at different wavelengths. It can be generated in

936-479: Is very reactive, as the individual atoms of oxygen tend to quickly bond with nearby molecules. Its lowest-energy electronic state is a spin triplet , designated by the term symbol P. On Earth's surface, it exists naturally for a very short time. In outer space , the presence of ample ultraviolet radiation results in a low Earth orbit atmosphere in which 96% of the oxygen occurs in atomic form. Atomic oxygen has been detected on Mars by Mariner , Viking , and

988-518: The Esat name as Digifone, became a part of the newly formed separate company, mmO2 plc. Digifone became O2 Ireland in 2001 as a subsidiary of mmO2 plc following the demerger from BT. O2 Ireland became a subsidiary of Telefónica in 2006, after its parent company O2 in the United Kingdom was purchased. In June 2013, Hutchison Whampoa announced it would acquire the Republic of Ireland arm of O2 for €780m. O2

1040-447: The SOFIA observatory. The common allotrope of elemental oxygen on Earth, O 2 , is generally known as oxygen, but may be called dioxygen , diatomic oxygen , molecular oxygen , dioxidene or oxygen gas to distinguish it from the element itself and from the triatomic allotrope ozone , O 3 . As a major component (about 21% by volume) of Earth's atmosphere , elemental oxygen

1092-666: The Wireless Festival , a music festival held annually in London (and near Leeds in 2006 and 2007). Telefónica O2 was the sponsor of the Cork GAA Football and Hurling teams and the Irish rugby team . The partnership with Irish rugby went interactive in 2006, when Ireland fans were offered access to daily updates from head coach Eddie O'Sullivan . In 2009, O2 launched their 'BeTheDifference' integrated advertising campaign where fans had

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1144-423: The superoxide ion ( O − 2 ) or the dioxygenyl ion ( O + 2 ). The ground state of O 2 has a bond length of 121  pm and a bond energy of 498 kJ/mol. It is a colourless gas with a boiling point of −183 °C (90 K; −297 °F). It can be condensed from air by cooling with liquid nitrogen, which has a boiling point of −196 °C (77 K; −321 °F). Liquid oxygen

1196-459: The upper atmosphere splits O 2 . Ozone absorbs strongly in the ultraviolet and in the stratosphere functions as a shield for the biosphere against mutagenic and other damaging effects of solar UV radiation (see ozone layer ). Tropospheric ozone is formed near the Earth's surface by the photochemical disintegration of nitrogen dioxide in the exhaust of automobiles . Ground-level ozone

1248-551: The Army, Marine Corps, Air Force, and Space Force Lieutenant (junior grade) in the Navy, Coast Guard, Public Health Service Commissioned Corps, and NOAA Commissioned Officer Corps See also [ edit ] 02 (disambiguation) Oz (disambiguation) 2O (disambiguation) 2Q (disambiguation) Q2 (disambiguation) [REDACTED] Topics referred to by the same term This disambiguation page lists articles associated with

1300-579: The England rugby team and the Rugby Football Union , as well as O2 rugbyclass and Premier Rugby Ltd for the English Premiership . Telefónica O2 also had a long-standing relationship with Arsenal F.C. , being their shirt sponsor from 2002 to 2006. In 2005, a three-year deal was signed that saw Telefónica O2 become the team's exclusive Mobile Communications Partner. From 2005 to 2008, O2 sponsored

1352-676: The German UMTS licence auction the previous year. Viag Interkom's mobile operations were transferred into the BT Wireless family and the fixed business became BT (Germany) GmbH & CO. Viag Interkom became O2 Germany as a subsidiary of mmO2 plc in 2001, following the demerger from BT. Telfort was created in March 1997 as a 50:50 joint venture between BT and Nederlandse Spoorwegen (the Dutch national railways operator) and headquartered in Amsterdam. Telfort

1404-500: The Netherlands, and Genie Asia became O2 Asia. O2 Asia became a subsidiary of O2 UK for governance purposes. Following the demerger of British Telecommunications plc in 2001, mmO2 plc was created as the holding company for BT's former mobile network assets and was split from the rest of the company, now named BT Group plc. During this period, O2 Netherlands was sold to Dutch investment group Greenfield Capital Partners in 2003. mmO2 plc

1456-711: The Netherlands. The Genie Asia business continued portal operations in Asia. After demerging from BT in 2001, the European Genie business became the basis of a central products and services division called 'Products O2' and the Genie Mobile business was rebranded to 'O2 Online' which continues in the UK as a mobile communications service provider tied to the O2 UK network. The Genie portal properties were rebranded O2 Active in UK, Germany, Ireland and

1508-622: The O2 network. In May 2020, it was reported that Telefónica and Liberty Global plan to merge the UK operations of O2 with Virgin Media , a pay-TV and broadband provider in that country, owned by Liberty Global. Telefónica Ireland was providing broadband and telecommunications in Ireland under the O2 brand. O2 Ireland was previously called Esat Digifone when it was owned by Esat Telecommunications (and Telenor ) from 1997 to 2006. O2 Ireland became part of Telefónica in 2006 as part of its purchase of O2 in

1560-735: The Royal Netherlands Navy Oldershaw O-2 , a glider SP&S Class O-2 , a 1910 steam locomotives class USS O-2 (SS-63) , a 1918 United States O class submarine Orbital O2 , a tidal power turbine in Orkney GNR Class O2 , a class of British steam locomotives classified O2 by both the GNR and the LNER Other uses [ edit ] O-2, a pay grade in the US uniformed services First lieutenant (United States) in

1612-530: The UK. In June 2013, Hutchison Whampoa announced it would acquire the Irish arm of O2 for €780m. In March 2015, the company was merged into Hutchison Whampoa's subsidiary Three Ireland . Český Telecom was the new name given to a company previously known as SPT Telecom which was formed from the splitting off of the Czech Ministry of Posts and Telecommunications into postal and telecom sides in 1993. The company

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1664-682: The United Kingdom and Germany, and licensed its brand to former operations in the Republic of Ireland , the Czech Republic, and Slovakia. O2 has additionally established a joint venture with Tesco Mobile in the United Kingdom, Republic of Ireland and in Slovakia, and the Tchibo Mobilfunk network in Germany. Cellnet was launched in January 1985 as a subsidiary of Telecom Securicor Cellular Radio Limited ,

1716-574: The chance to have their names included on the O2 Rugby posters and on the Irish Rugby players' jerseys. The integrated campaign was created by O2's two Irish advertising agencies: McConnells ( above-the-line ) and Brando ( below-the-line ). The interactive campaign won an award at the 2009 Kinsale Sharks. On 31 May 2005, Telefónica O2 acquired the naming rights for the redeveloped Millennium Dome in London from Anschutz Entertainment Group (AEG). The Dome

1768-523: The company back to the Telfort name. Telfort eventually became a wholly owned subsidiary of KPN . Manx Telecom was demerged from BT as part of the mmO2 flotation in 2001. Unlike some of the company's counterparts, the fixed and mobile arms of Manx Telecom were not split prior to the demerger, which meant that Manx Telecom was the mmO2 group's only fixed operation at the time. After the demerger from BT in 2001, Manx Telecom continued to trade under its brand as

1820-536: The completion of the acquisition in February 2006, Telefónica undertook a corporate organisational change that saw the merging of its fixed and mobile businesses in Spain, and the transfer of Telefónica's non-Spanish European telecommunications properties into the O2 brand. Thus, the Český Telecom and Eurotel operations in the Czech Republic as well as the Telefónica Deutschland business in Germany were brought into

1872-523: The early 1900s, when it was known as oxozone. It was identified in 2001 by a team led by Fulvio Cacace at the University of Rome. The molecule O 4 was thought to be in one of the phases of solid oxygen later identified as O 8 . Cacace's team suggested that O 4 probably consists of two dumbbell-like O 2 molecules loosely held together by induced dipole dispersion forces. There are six known distinct phases of solid oxygen. One of them

1924-478: The governance of O2, which retained its UK registered public company status with its own board of directors and corporate governance structures and processes. Telefónica chose to keep their existing mobile phone operations in the rest of the world under the brand Movistar . This name is used in Spain and in most Latin America countries, operated by a separate management team. Telefónica sold its O2 Asia subsidiary in

1976-771: The ion dioxygenyl O , doubly ionized oxygen O2, an EEG electrode site according to the 10–20 system SGI O2 , a Unix workstation computer UOC O2 , institutional repository of the Open University of Catalonia O2 , the earliest defined spectral class for stars Places [ edit ] The O2 , an entertainment district in London, England The O2 Arena , the arena within The O2 O2 Arena (Prague) or Sazka Arena, an arena in Prague, Czech Republic O2 Centre , an indoor shopping and entertainment centre on Finchley Road, London, England O2 Residence ,

2028-530: The rival UK network Three , to buy the company. The following year, the European Commission blocked the takeover. Telefónica operates its businesses under the O2 brand through its subsidiaries Telefónica UK and Telefónica Germany . Telefónica Spain uses Movistar as its flagship brand, while O2 is a secondary low-cost brand. Telefónica owns the Giffgaff MVNO in the United Kingdom, which uses

2080-407: The rock band FireHouse O2 (O-Town album) (2002) album by American boy band O-Town O 2 (Tonéx album) (2002) album by Gospel singer Tonéx O2: Avalon Remixed , a 2002 album by Avalon O2 (Son of Dave album) , 2006 album by Son of Dave Songs [ edit ] "O2", a song by Orange Range from Panic Fancy "O2", a 2002 song by Sleater-Kinney from One Beat "O2",

2132-531: The same title formed as a letter–number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=O2&oldid=1260348114 " Category : Letter–number combination disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Dioxygen Atomic oxygen, denoted O or O 1 ,

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2184-411: The time it became a part of the BT Wireless family of companies in 2001, Genie had mobile portal operations in the UK, Germany, Spain, Italy, the Netherlands, Hong Kong and Japan, and an Internet MVNO operation in UK called Genie Mobile. Prior to the demerger of O2 from BT, Genie scaled back its global operations in order to align with the mobile businesses demerging with it; namely UK, Germany, Ireland and

2236-458: Was announced that it would be sold with its parent company to PPF. The BT Cellnet consumer brand was renamed O2 – the chemical symbol for unbound oxygen – as were all the group's other businesses (other than Manx Telecom ). The re-branding was designed by the Lambie-Nairn design agency, which developed the idea of the company supplying services that were essential, much the same as oxygen

2288-492: Was awarded a licence by the government of the Netherlands to provide fixed telecommunications services in November of that year, and a mobile licence was awarded the following year. In 2000, the mobile operations of Telfort became a part of the BT Wireless family. Telfort became O2 Netherlands as a subsidiary of mmO2 plc in 2001, following the demerger from BT. In 2003, O2 sold the company to Greenfield Capital Partners which reverted

2340-538: Was created in 2000, as the demerged mobile business of the prior Esat Digifone which had just been purchased by BT. Esat Digifone was originally a joint venture between Esat Telecom and Telenor. After the acquisition of Esat Telecom by BT, the Telenor share in Esat Digifone was also acquired by BT. Subsequently, the fixed operations, Esat Telecom later became BT Ireland and the demerged mobile operations, rebranded without

2392-446: Was later renamed O2 plc before being taken over by Telefónica. On 31 October 2005, O2 plc agreed to be taken over by Telefónica , a Spanish telecommunications company, with a cash offer of £17.7 billion, or £2 per share. According to the merger announcement, O2 retained its name and continued to be based in the United Kingdom, keeping both the brand and the management team. The merger became unconditional on 23 January 2006. Following

2444-575: Was merged into Hutchison Whampoa's subsidiary Three Ireland in March 2015. Viag Interkom was created in 1995 as a joint venture of the German power supply firm VIAG (45%), British BT Group (then called British Telecommunications) (45%) and Norwegian Telenor (10%) in order to compete for official licence to provide services in the rapidly liberalising German (fixed and mobile) telecommunications market at that time. In 2001 BT acquired VIAG's share (owned by German energy company E.ON) for €11.4 billion following

2496-408: Was named "ozon" in 1840 by Christian Friedrich Schönbein , from ancient Greek ὄζειν (ozein: "to smell") plus the suffix -on , commonly used at the time to designate a derived compound and anglicized as -one . Ozone is thermodynamically unstable and tends to react toward the more common dioxygen form. It is formed by reaction of intact O 2 with atomic oxygen produced when UV radiation in

2548-520: Was providing services for large corporations only. In 2006 the company was renamed Telefónica O2 Slovakia and won a tender for the 3rd mobile phone operator in Slovakia . On 2 February 2007, Telefónica O2 Slovakia started providing services in Slovakia for first customers "O2 Jednotky". On 28 February O2 launched classic services and opened first shop in Slovakia (in Bratislava on Obchodná street). In 2013 it

2600-432: Was renamed to Telefónica Czech Republic. In 2013 was announced that Telefónica would sell its stake in the company to PPF . Under the terms of the sale, the company would continue to use the O2 brand for a maximum of four years. The agreement was later extended, and the company continues under the O2 brand as of January 2024. In 2002 Český Telecom founded Czech Telecom Slovakia , its subsidiary in Slovakia . The company

2652-462: Was renamed to Český Telecom in 2000 and remained a government-controlled company until its complete privatisation in 2004. Along the way, rapid modernisation of the network occurred with the help of funding and expertise of the Dutch and Swiss consortium called TelSource. In parallel to the evolution of Český Telecom, the Eurotel mobile phone business was established in 1990 in a joint venture between what

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2704-511: Was then known as the Czechoslovak telecom ministry, Bell Atlantic and US West. In 1996, GSM services were introduced, and in 2003 Český Telecom acquired full control of Eurotel. The Czech Republic government sold its remaining stake in Český Telecom (along with its Eurotel subsidiary) to Telefónica in 2005 which renamed it to Telefónica O2 Czech Republic and since 2006 started to use the O2 brand for both fixed and mobile services. In 2011 company

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