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 * 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 Interna ...

* Irish Volunteers, a military organization * Italia Viva, 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'', 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 Inverness postcode area in the UK * Isla Vista, 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 * 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 ...