IV may refer to:

Businesses and organizations

Immigration Voice Immigration Voice is a 501(c)(4) nonprofit organization that claims to work to alleviate problems faced by high-skilled foreign workers in the United States, but has mostly advocated for the Fairness for High Skilled Immigrants Act that benefits ...

, an activist organization *Industrievereinigung,

Federation of Austrian Industry The Federation of Austrian Industries ( de: ''Industriellenvereinigung'', short form IV) is the voluntary and independent representation of interests of Austrian industry and its related sectors. The IV maintains a wide net of contacts and relation ...

* Intellectual Ventures, a privately held intellectual property company *

InterVarsity Christian Fellowship InterVarsity Christian Fellowship/USA is an inter-denominational, evangelical Christian campus ministry founded in 1941, working with students and faculty on U.S. college and university campuses. InterVarsity is a charter member of the Internat ...

* Irish Volunteers, a military organization *

Italia Viva Italia Viva (, IV) is a liberal 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 (PD). History Background Matteo Renzi started ...

, an Italian centrist political party, led by former prime minister Matteo Renzi

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 1975 EP), 2013 * ''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'' (The Lookouts album), 1990 * ''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 * "I.V." (X Japan song), an X Japan song, 2008 * ''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 a ...

'', 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 band Led Zeppelin, commonly known as ''Led Zeppelin IV'', was released on 8 November 1971 by Atlantic Records. It was produced by guitarist Jimmy Page and recorded between December 1970 and Fe ...

'', 1971 *''

Toto IV ''Toto IV'' is the fourth studio album by American rock band Toto released in the spring of 1982 by Columbia Records. The lead single, " Rosanna", peaked at number 2 for five weeks on the ''Billboard'' Hot 100 charts, while the album's third si ...

'', 1982

Places

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

, a country *

IV postcode area The IV postcode area, also known as the Inverness postcode area, is a group of 52 postcode districts for post towns: Achnasheen, Alness, Avoch, Beauly, Bonar Bridge, Cromarty, Dingwall, Dornoch, Elgin, Moray, Elgin, Fochabers, Forres, Fortrose, ...

, the Inverness postcode area in the UK *

Isla Vista Isla Vista is an unincorporated community and census-designated place (CDP) in Santa Barbara County, California in the United States. As of 2020 census, the community had a population of 15,500. The majority of residents are college students at t ...

, an unincorporated community in the United States near Santa Barbara, California

In science and technology

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 nutri ...

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

Independent variable Dependent and independent variables are variables in mathematical modeling, statistical modeling and experimental sciences. Dependent variables receive this name because, in an experiment, their values are studied under the supposition or demand ...

, 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 * Initialization vector, in cryptography * Instrumental variable, in statistics *

Intrinsic value (finance) In finance, the intrinsic value of an asset usually refers to a value calculated on simplified assumptions. For example, the intrinsic value of an option is based on the current market value of the underlying instrument, but ignores the possibi ...

, of an option or stock *

Intrinsic viscosity Intrinsic viscosity \left \eta \right/math> is a measure of a solute's contribution to the viscosity \eta of a solution. It should not be confused with inherent viscosity, which is the ratio of the natural logarithm of the relative viscosity to the ...

* Trochlear nerve, the fourth cranial nerve

Other uses

4 (number) 4 (four) is a number, numeral (linguistics), numeral and numerical digit, digit. It is the natural number following 3 and preceding 5. It is the smallest semiprime and composite number, and is tetraphobia, considered unlucky in many East Asian c ...

in Roman numerals *''

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 in ...

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

Inter vivos trust A trust is a legal relationship in which the holder of a right gives it to another person or entity who must keep and use it solely for another's benefit. In the Anglo-American common law, the party who entrusts the right is known as the "settl ...