Re or RE may refer to:

Geography

Re, Norway Re is a former municipality in Vestfold county (as of 1 January 2020 Vestfold og Telemark), Norway. The administrative center of the municipality was the village of Revetal. The municipality was established in 2002 by the unification of the forme ...

, a former municipality in Vestfold county, Norway *

Re, Vestland Re or Reed is a village in Gloppen Municipality in Vestland county, Norway. The village is located on the eastern shore of the lake Breimsvatnet, along the European route E39 highway, about west of the village of Byrkjelo and about southeast of ...

, a village in Gloppen municipality, Vestland county, Norway * Re, Piedmont, an Italian municipality *

Île de Ré Île de Ré (; variously spelled Rhé or Rhéa; Poitevin: ''ile de Rét''; en, Isle of Ré, ) is an island off the Atlantic coast of France near La Rochelle, Charente-Maritime, on the northern side of the Pertuis d'Antioche strait. Its high ...

, an island off the west coast of France **

Le Bois-Plage-en-Ré Le Bois-Plage-en-Ré () is a commune in the Charente-Maritime department in the Nouvelle-Aquitaine region in southwestern France. It is situated on the Île de Ré Île de Ré (; variously spelled Rhé or Rhéa; Poitevin: ''ile de Rét''; ...

, a commune on that island * Re di Anfo, a torrent (seasonal stream) in Italy * Re di Gianico, Re di Niardo, Re di Sellero, and Re di Tredenus, torrents in the

Val Camonica Val Camonica (also ''Valcamonica'' or Camonica Valley, Eastern Lombard: ''Al Camònega'') is one of the largest valleys of the central Alps, in eastern Lombardy, Italy. It extends about from the Tonale Pass to Corna Trentapassi, in ...

Réunion Réunion (; french: La Réunion, ; previously ''Île Bourbon''; rcf, label= Reunionese Creole, La Rényon) is an island in the Indian Ocean that is an overseas department and region of France. It is located approximately east of the island ...

(ISO 3166-1 code), a French overseas department and island in the Indian Ocean

Music

* Re, the second syllable of the scale in

solfège In music, solfège (, ) or solfeggio (; ), also called sol-fa, solfa, solfeo, among many names, is a music education method used to teach aural skills, pitch and sight-reading of Western music. Solfège is a form of solmization, though the two ...

** Re, or

D (musical note) D"D note"
basicmusictheory.com is a musical note a

, the second note of the musical scale in ''fixed do'' solfège * Re: (band), a musical duo based in Canada and the United States

Albums

* ''Re'' (Café Tacuba album) * ''Re'' (Les Rita Mitsouko album) * ''Re.'' (Aya Ueto album) * ''Re:'' (Kard EP)

Other media

Resident Evil ''Resident Evil'', known in Japan as is a Japanese horror game series and media franchise created by Capcom. It consists of survival horror, third-person shooter and first-person shooter games, with players typically surviving in environmen ...

, popular video game franchise of survival horror * ''...Re'' (film), a 2016 Indian Kannada-language film

Language

* re (interjection), in Greek *

Re (kana) れ, in hiragana, or レ in katakana, is one of the Japanese kana, each of which represents one mora. The hiragana is written in two strokes, while katakana in one. Both represent the sound . The shapes of these kana have origins in the charact ...

, the Japanese syllables written れ and レ * ''

In re ''In re'', Latin for "in the matter f, is a term with several different, but related meanings. Legal use In the legal system in the United States, ''In re'' is used to indicate that a judicial proceeding may not have formally designated advers ...

'', Latin for 'in the matter of...' ** RE: and Re:, used in email subject lines

People

* Giovanni Battista Re, Italian cardinal *

Cayetano Ré Cayetano Ré Ramírez (7 February 1938 – 26 November 2013) was a Paraguayan professional football player and manager. Career Ré began his career in Asunción, playing for Cerro Porteño before signing for Spanish side Elche CF in 1959. A ...

, former Paraguayan footballer

Political parties

Renew Europe Renew Europe (Renew) is a liberal, pro-European political group of the European Parliament founded for the ninth European Parliament term. The group is the successor to the Alliance of Liberals and Democrats for Europe (ALDE) group which ...

, a political group in the European Parliament *

Renovación Española Spanish Renovation ( es, Renovación Española, RE) was a Spanish monarchist political party active during the Second Spanish Republic, advocating the restoration of Alfonso XIII of Spain as opposed to Carlism. Associated with the Acción Espa� ...

, a former Spanish monarchist political party

Science, technology and mathematics

Computer science and mathematics

RE (complexity) In computability theory and computational complexity theory, RE (recursively enumerable) is the class of decision problems for which a 'yes' answer can be verified by a Turing machine in a finite amount of time. Informally, it means that if the an ...

(recursively enumerable), a complexity class of decision problems ** r.e., a common abbreviation for the older term

Recursively enumerable In computability theory, a set ''S'' of natural numbers is called computably enumerable (c.e.), recursively enumerable (r.e.), semidecidable, partially decidable, listable, provable or Turing-recognizable if: *There is an algorithm such that the ...

Regular expression A regular expression (shortened as regex or regexp; sometimes referred to as rational expression) is a sequence of characters that specifies a search pattern in text. Usually such patterns are used by string-searching algorithms for "find" ...

, a sequence of characters to match text against a specified pattern * Re function in mathematics, where Re(''z'') denotes the real part of a

complex number In mathematics, a complex number is an element of a number system that extends the real numbers with a specific element denoted , called the imaginary unit and satisfying the equation i^= -1; every complex number can be expressed in the for ...

''z''

Other uses in science and technology

Effective reproduction number In epidemiology, the basic reproduction number, or basic reproductive number (sometimes called basic reproduction ratio or basic reproductive rate), denoted R_0 (pronounced ''R nought'' or ''R zero''), of an infection is the expected number of ...

, in epidemiology *

Relative effectiveness TNT equivalent is a convention for expressing energy, typically used to describe the energy released in an explosion. The is a unit of energy defined by that convention to be , which is the approximate energy released in the detonation of a ...

, or RE factor, an expression of an explosive's demolition power * Renewable energy *

Reverse engineering Reverse engineering (also known as backwards engineering or back engineering) is a process or method through which one attempts to understand through deductive reasoning how a previously made device, process, system, or piece of software accompli ...

* Reynolds number, a dimensionless quantity in fluid mechanics used to help predict flow patterns *

Rhenium Rhenium is a chemical element with the symbol Re and atomic number 75. It is a silvery-gray, heavy, third-row transition metal in group 7 of the periodic table. With an estimated average concentration of 1 part per billion (ppb), rhenium is on ...

, symbol Re, a chemical element * Re, an abbreviation for "reference pressure" as

Sound pressure level Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average or equilibrium) atmospheric pressure, caused by a sound wave. In air, sound pressure can be measured using a microphone, and in water with a hydrophon ...

* Re, an abbreviation for "reference pressure" in

Underwater acoustics Underwater acoustics is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water, its contents and its boundaries. The water may be in the ocean, a lake, a river or a tank. T ...

Other uses

Religious education In secular usage, religious education is the teaching of a particular religion (although in the United Kingdom the term ''religious instruction'' would refer to the teaching of a particular religion, with ''religious education'' referring to te ...

(RE), the study of religion *

Re (Egyptian religion) Ra (; egy, rꜥ; also transliterated ; cuneiform: ''ri-a'' or ''ri-ia''; Phoenician: 𐤓𐤏, CIS I 3778 romanized: rʿ) or Re (; cop, ⲣⲏ, translit=Rē) was the ancient Egyptian deity of the sun. By the Fifth Dynasty, in the 25th ...

, an ancient Egyptian god also known as Ra *

Regional-Express In Germany, Luxembourg and Austria, the Regional-Express (RE, or in Austria: REX) is a type of regional train. It is similar to a semi-fast train, with average speed at about 70–90 km/h (top speed often 160 km/h) as it calls at ...

, a type of regional train in Germany, Luxembourg and Austria * Royal Engineers, a part of the British Army *

Royal Society of Painter-Printmakers The Royal Society of Painter-Printmakers (RE), known until 1991 as the Royal Society of Painter-Etchers and Engravers, is a leading art institution based in London, England. The Royal Society of Painter-Etchers, as it was originally styled, was ...

, whose fellows may use the Post-nominal letters RE