IV may refer to:

Businesses and organizations

In the United States

Immigration Voice Immigration Voice is a 501(c)(4) nonprofit organization advocating to alleviate problems faced by high-skilled immigrant workers in the United States, through the legislative branch of congress. History Immigration Voice is a 501(c)(4) Nonpro ...

, an activist organization *

Intellectual Ventures Intellectual Ventures is an American private equity company that centers on the development and licensing of intellectual property. Intellectual Ventures is one of the top-five owners of U.S. patents, as of 2011. Its business model focuses on b ...

, a privately held intellectual property company *

InterVarsity Christian Fellowship InterVarsity Christian Fellowship/USA (IVCF) is an evangelicalism, evangelical Christianity, Christian student movement with affiliate groups on university campuses in U.S.. It is a member of the International Fellowship of Evangelical Students ...

Elsewhere

* Federation of Austrian Industries () *

Irish Volunteers The Irish Volunteers (), also known as the Irish Volunteer Force or the Irish Volunteer Army, was a paramilitary organisation established in 1913 by nationalists and republicans in Ireland. It was ostensibly formed in response to the format ...

, a military organization *

Italia Viva Italia Viva (, IV) is a Liberalism, liberal list of political parties in Italy, political party in Italy founded in September 2019. The party is led by Matteo Renzi, a former Prime Minister of Italy and former secretary of the Democratic Party ( ...

, an Italian centrist political party

Music

Subdominant In music, the subdominant is the fourth tonal degree () of the diatonic scale. It is so called because it is the same distance ''below'' the tonic as the dominant is ''above'' the tonicin other words, the tonic is the dominant of the subdomina ...

, in music theory

Recordings

* ''IV'' (The Aggrolites album), 2009 * ''IV'' (Angband album), 2020 * ''IV'' (BadBadNotGood album), 2016 * ''IV'' (Black Mountain album), 2016 * ''IV'' (Cypress Hill album), 1998 * ''IV'' (Diamond Rio album), 1996 * ''IV'' (Goatsnake album), 1998 * ''IV'' (Godsmack album), 2006 * ''IV'' (Hiroyuki Sawano album), 2021 * ''I.V.'' (Loma Prieta album), 2012 * ''IV'' (Maylene and the Sons of Disaster album), 2011 * ''IV'' (Ton Steine Scherben album), 1981 * ''IV'' (The Stranglers album), 1980 * ''IV'' (To/Die/For album), 2004 * ''IV'' (Veruca Salt album), 2006 * ''IV'' (Winger album), 2006 * ''IV'' (Željko Joksimović album), 2005 *''

Faust IV ''Faust IV'' is the fourth studio album by the German krautrock group Faust, released in 1973. The album is included in the book '' 1001 Albums You Must Hear Before You Die'', where it is referred to as a "krautrock classic". This was the last ...

'', 1973 *'' Good Apollo, I'm Burning Star IV, Volume One: From Fear Through the Eyes of Madness'', by Coheed and Cambria, 2005 *''

Led Zeppelin IV The untitled fourth studio album by the English Rock music, rock band Led Zeppelin, commonly known as ''Led Zeppelin IV'', was released on 8 November 1971, by Atlantic Records. It was produced by the band's guitarist, Jimmy Page, and recorded be ...

'', 1971 *''

Toto IV ''Toto IV'' is the fourth studio album by American rock music, rock band Toto (band), Toto, released on April 8, 1982, by Columbia Records. The album's lead single, "Rosanna (song), Rosanna", peaked at number 2 for five weeks on the Billboard Hot ...

'', 1982 * ''IV'' (EP), a 2013 EP by The 1975 * "I.V." (song), by X Japan, 2008 * ''IV'', 1998 album by

Siam Shade Siam Shade (stylized as SIAM SHADE) was a five-piece Japanese rock band, formed in Tokyo in 1991. The classic line-up of Hideki on vocals, Natchin on bass, Kazuma and Daita on guitar, and Jun-ji on drums broke onto the visual kei scene alongs ...

*''IV'', a 1990 EP by

The Lookouts The Lookouts were an American punk rock band that existed from 1985 to 1990 on Iron Peak, a remote rural mountain community outside Laytonville, California. The members were Larry Livermore on guitar and vocals, Kain Kong (Kain Hanschke) on ...

Places

Ivory Coast Ivory Coast, also known as Côte d'Ivoire and officially the Republic of Côte d'Ivoire, is a country on the southern coast of West Africa. Its capital city of Yamoussoukro is located in the centre of the country, while its largest List of ci ...

, a country in West Africa *

IV postcode area IV may refer to: Businesses and organizations In the United States *Immigration Voice, an activist organization *Intellectual Ventures, a privately held intellectual property company *InterVarsity Christian Fellowship Elsewhere *Federation of Aus ...

, north Scotland * Isla Vista, California, United States

In science, technology and mathematics

Intravenous therapy Intravenous therapy (abbreviated as IV therapy) is a medical technique that administers fluids, medications and nutrients directly into a person's vein. The intravenous route of administration is commonly used for rehydration or to provide nutr ...

, a route of administration of a drug * I–V curve, current–voltage curve characteristic * Implied volatility, a term in financial mathematics *

Independent variable A variable is considered dependent if it depends on (or is hypothesized to depend on) an independent variable. Dependent variables are studied under the supposition or demand that they depend, by some law or rule (e.g., by a mathematical function ...

, in mathematical and statistical modeling *

Independent verification systems Independent verification (IV) systems or Independent Dual Verification (IDV) are voting machines that produce at least two independent auditable records of votes where the second record is used to check the first. To be considered "independent" at ...

, in voting machines *

Induction variable In computer science, an induction variable is a variable that gets increased or decreased by a fixed amount on every iteration of a loop or is a linear function of another induction variable. For example, in the following loop, i and j are induct ...

, in computer science *

Initialization vector In cryptography, an initialization vector (IV) or starting variable is an input to a cryptographic primitive being used to provide the initial state. The IV is typically required to be random or pseudorandom, but sometimes an IV only needs to be un ...

, in cryptography *

Instrumental variable In statistics, econometrics, epidemiology and related disciplines, the method of instrumental variables (IV) is used to estimate causal relationships when controlled experiments are not feasible or when a treatment is not successfully delivered to ...

, in statistics * Intrinsic viscosity *

Trochlear nerve The trochlear nerve (), ( lit. ''pulley-like'' nerve) also known as the fourth cranial nerve, cranial nerve IV, or CN IV, is a cranial nerve that innervates a single muscle - the superior oblique muscle of the eye (which operates through the pu ...

, the fourth cranial nerve

Other uses

4 (number) 4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is a square number, the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures. Evolution of the H ...

in Roman numerals *

Four-Phase Systems Four-Phase Systems, Inc., was a computer company, founded by Lee Boysel and others, which built one of the earliest computers using semiconductor main memory and MOS LSI logic. The company was incorporated in February 1969 and had moderate com ...

, a computer company whose logo was a stylized "IV" *''

International Viewpoint ''International Viewpoint'' is the English-language online magazine of the Trotskyist reunified Fourth International. It focuses on publishing articles on the political and social situation throughout the world, notably by translating articles ...

'', an online magazine of the Trotskyist reunified Fourth International *

Inter vivos trust A trust is a legal relationship in which the owner of property, or any transferable right, gives it to another to manage and use solely for the benefit of a designated person. In the English common law, the party who entrusts the property is k ...

, a legal instrument *

Coleman Williams Coleman Emmett Williams (born Coleman Finchum, November 7, 1991), known professionally as IV (pronounced ''four''), is an American country-music singer and songwriter. A member of the country music Williams dynasty, he is the son of Hank Williams ...

, American country music singer known professionally as IV