Re or RE may refer to:

Arts, media and entertainment

* '' ...Re'', a 2016 Indian Kannada-language film * ''

Realencyclopädie der classischen Altertumswissenschaft The Pauly encyclopedias or the Pauly-Wissowa family of encyclopedias, are a set of related encyclopedias on Greco-Roman world, Greco-Roman classical studies, topics and scholarship. The first of these, or (1839–1852), was begun by compiler A ...

'', a German encyclopedia of classical scholarship * ''

Resident Evil ''Resident Evil'', known as in Japan, 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 environments ...

'', a horror game franchise

Music

* Re, the second syllable of the scale in

solfège In music, solfège (British English or American English , ) or solfeggio (; ), also called sol-fa, solfa, solfeo, among many names, is a mnemonic used in teaching aural skills, Pitch (music), pitch and sight-reading of Western classical music, W ...

D (musical note) D is a musical note a whole tone above C, and is known as Re within the fixed-Do solfege system. Its enharmonic equivalents are C (C-double sharp) and E (E-double flat). It is the third semitone of the solfège. When calculated in equal t ...

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

Albums

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

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 char ...

(れ and レ), Japanese syllables * ''

In re , Latin for , is a term with several different, but related meanings. Legal use In the legal system in the United States, is used to indicate that a judicial proceeding may not have formally designated adverse parties or is otherwise uncontes ...

'', Latin for 'in the matter of...' ** RE: and Re:, a standard email subject line prefix

Organisations

Renew Europe Renew Europe (or simply Renew) is a liberal, centrist to centre-right, 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 Dem ...

, a political group in the European Parliament * Renovación Española, a former Spanish monarchist political party *

Royal Engineers The Corps of Royal Engineers, usually called the Royal Engineers (RE), and commonly known as the ''Sappers'', is the engineering arm of the British Army. It provides military engineering and other technical support to the British Armed Forces ...

, a part of the British Army * Royal Society of Painter-Printmakers, whose fellows may use the Post-nominal letters RE * Stobart Air (former IATA code: RE), a former Irish regional airline

Places

Re, Norway Re is a former municipality in Vestfold county, Norway. The municipality existed from 2000 until its dissolution in 2020. The area is now part of Tønsberg Municipality. The administrative centre was the village of Revetal. Other villages i ...

, a former municipality in Vestfold county * Re, Vestland, a village in Gloppen municipality, Vestland county, Norway *

Re, Piedmont Re () is a village and ''comune'' in the Province of Verbano-Cusio-Ossola, in the region of Piedmont (Italy), Piedmont, Italy, approximately from Domodossola and from the border with Switzerland. It is situated on the Domodossola-Locarno railwa ...

, an Italian municipality *

Île de Ré Île de Ré (; variously spelled Rhé or Rhéa; Poitevin dialect, Poitevin: ''ile de Rét''; , ) 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. Population See also * Communes of the Charente-Maritime department The f ...

, a commune on that island *

Re di Anfo The Re di Anfo is a stream (or '' torrente'') in the Province of Brescia, Lombardy. Its source is on Cima Meghè and it flows into Lago d'Idro at Anfo on the western side of the lake. Its entire course is contained within the territory of the ...

, 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 or Valcamonica (), also Valle Camonica and anglicized as Camonica Valley, 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 the c ...

, Lombardy, Italy *

Réunion Réunion (; ; ; known as before 1848) is an island in the Indian Ocean that is an overseas departments and regions of France, overseas department and region of France. Part of the Mascarene Islands, it is located approximately east of the isl ...

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

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 An infection is th ...

, in epidemiology *

Relative effectiveness TNT equivalent is a convention for expressing energy, typically used to describe the energy released in an explosion. A ton of TNT equivalent is a unit of energy defined by convention to be (). It is the approximate energy released in the det ...

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

Reynolds number In fluid dynamics, the Reynolds number () is a dimensionless quantity that helps predict fluid flow patterns in different situations by measuring the ratio between Inertia, inertial and viscous forces. At low Reynolds numbers, flows tend to ...

(), a dimensionless quantity in fluid mechanics used to help predict flow patterns *

Rhenium Rhenium is a chemical element; it has 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 one ...

(symbol Re), a chemical element * Reference pressure (Re), 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 hydrophone ...

* Reference pressure (Re), in

underwater acoustics Underwater acoustics (also known as hydroacoustics) 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 oce ...

Computing 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 answ ...

(recursively enumerable), a complexity class of decision problems **

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 ...

(r.e.), in computability theory *

Regular expression A regular expression (shortened as regex or regexp), sometimes referred to as rational expression, is a sequence of characters that specifies a match 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'' * .re, the Internet country code top-level domain for Réunion

People

* Ré (futsal player), Portuguese futsal player * Andrea Re (born 1963), Italian rower * Cayetano Ré (1938–2013), Paraguayan footballer * Christopher Ré, American computer scientist * Davide Re, Italian runner * Germán Ré, Argentine footballer *

Giovanni Battista Re Giovanni Battista Re (born 30 January 1934) is an Catholic Church in Italy, Italian Catholic prelate who has served as Dean of the College of Cardinals since 2020. He was elevated to the rank of Cardinal (Catholic Church), cardinal in 2001 and s ...

(born 1934), Italian cardinal * Maximiliano Ré, Argentine-Italian footballer * Paul Ré, American artist and writer * Savannah Ré, Canadian singer-songwriter * Vincenzo Re, Italian scenic designer

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 t ...

(RE), the study of religion *

Re (Egyptian religion) Ra is the Sun-god of Ancient Egypt. Ra or RA may also refer to: Arts and entertainment Film and television * Ra (Stargate), a character from the film ''Stargate'', based on the Egyptian god * ''Ra'' (1972 film), a 1972 documentary film about ...

, an ancient Egyptian god *

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 a top speed of and an average speed of about as it calls at fewer stations than ''R ...

, a type of regional train in Germany, Luxembourg and Austria