S is the nineteenth letter of the English alphabet. S may also refer to:

History

* an Anglo-Saxon charter's number in Peter Sawyer's, catalogue

Language and linguistics

Long s The long s , also known as the medial s or initial s, is an archaic form of the lowercase letter . It replaced the single ''s'', or one or both of the letters ''s'' in a 'double ''s sequence (e.g., "ſinfulneſs" for "sinfulness" and "po� ...

(ſ), a form of the lower-case letter s formerly used where "s" occurred in the middle or at the beginning of a word * -s, a suffix added to some English surnames, originally meaning "son of" * , the

International Phonetic Alphabet The International Phonetic Alphabet (IPA) is an alphabetic system of phonetic notation based primarily on the Latin script. It was devised by the International Phonetic Association in the late 19th century as a standardized representation ...

symbol for a

voiceless alveolar sibilant The voiceless alveolar fricatives are a type of fricative consonant pronounced with the tip or blade of the tongue against the alveolar ridge (gum line) just behind the teeth. This refers to a class of sounds, not a single sound. There are at le ...

sound * S, the subject of an

intransitive verb In grammar, an intransitive verb is a verb whose context does not entail a direct object. That lack of transitivity distinguishes intransitive verbs from transitive verbs, which entail one or more objects. Additionally, intransitive verbs are ...

Mathematics and logic

* Integral symbol (∫), used in mathematics to denote integrals and antiderivatives *

S combinator Combinatory logic is a notation to eliminate the need for quantified variables in mathematical logic. It was introduced by Moses Schönfinkel and Haskell Curry, and has more recently been used in computer science as a theoretical model of compu ...

in combinatory logic *

Sphere A sphere () is a geometrical object that is a three-dimensional analogue to a two-dimensional circle. A sphere is the set of points that are all at the same distance from a given point in three-dimensional space.. That given point is the c ...

* ''s(n)'', the

aliquot sum In number theory, the aliquot sum ''s''(''n'') of a positive integer ''n'' is the sum of all proper divisors of ''n'', that is, all divisors of ''n'' other than ''n'' itself. That is, :s(n)=\sum\nolimits_d. It can be used to characterize the prime ...

of an integer n

Physics and chemistry

Sulfur Sulfur (or sulphur in British English) is a chemical element with the symbol S and atomic number 16. It is abundant, multivalent and nonmetallic. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formul ...

, symbol S, a chemical element * S, the symbol for

entropy Entropy is a scientific concept, as well as a measurable physical property, that is most commonly associated with a state of disorder, randomness, or uncertainty. The term and the concept are used in diverse fields, from classical thermodyna ...

* S, a non-SI unit used to designate molecule size named after the Svedberg sedimentation coefficient * ''S'', a label that denotes one of two chiral center configurations in the ''R''/''S'' system * ''s'', one of the

Mandelstam variables In theoretical physics, the Mandelstam variables are numerical quantities that encode the energy, momentum, and angles of particles in a scattering process in a Lorentz-invariant fashion. They are used for scattering processes of two particles t ...

, the square of the invariant mass *

Siemens (unit) The siemens (symbol: S) is the unit of electric conductance, electric susceptance, and electric admittance in the International System of Units (SI). Conductance, susceptance, and admittance are the reciprocals of resistance, reactance, and ...

, the SI derived unit of electric conductance *

S-block A block of the periodic table is a set of elements unified by the atomic orbitals their valence electrons or vacancies lie in. The term appears to have been first used by Charles Janet. Each block is named after its characteristic orbital: s-blo ...

of the periodic table, which includes alkali metals, alkaline earth metals, and hydrogen and helium *

Spin (physics) Spin is a conserved quantity carried by elementary particles, and thus by composite particles (hadrons) and atomic nuclei. Spin is one of two types of angular momentum in quantum mechanics, the other being ''orbital angular momentum''. The orbit ...

* s, an abbreviation for

solid Solid is one of the four fundamental states of matter (the others being liquid, gas, and plasma). The molecules in a solid are closely packed together and contain the least amount of kinetic energy. A solid is characterized by structur ...

Biology and medicine

Serine Serine (symbol Ser or S) is an α-amino acid that is used in the biosynthesis of proteins. It contains an α- amino group (which is in the protonated − form under biological conditions), a carboxyl group (which is in the deprotonated − for ...

, a standard amino acid abbreviation * ATC code S ''Sensory organs'', a section of the Anatomical Therapeutic Chemical Classification System *

S phase S phase (Synthesis Phase) is the phase of the cell cycle in which DNA is replicated, occurring between G1 phase and G2 phase. Since accurate duplication of the genome is critical to successful cell division, the processes that occur during ...

or synthesis phase, a period in the cell cycle during interphase

Computing

Samsung Galaxy S (2010 smartphone) The Samsung Galaxy S (retrospectively referred to unofficially as the Samsung Galaxy S1, Galaxy S1 or original Galaxy S) was a touchscreen-enabled, slate-format Android smartphone designed, developed, and marketed by Samsung Electronics; it ...

, the first flagship smartphone of the Samsung Galaxy S series *

S (programming language) S is a statistical programming language developed primarily by John Chambers and (in earlier versions) Rick Becker and Allan Wilks of Bell Laboratories. The aim of the language, as expressed by John Chambers, is "to turn ideas into software, quic ...

, an environment for statistical computing and graphics * <s>, the opening tag for the

HTML element An HTML element is a type of HTML (HyperText Markup Language) document component, one of several types of HTML nodes (there are also text nodes, comment nodes and others). The first used version of HTML was written by Tim Berners-Lee in 1993 ...

denoting information that is "no longer accurate or no longer relevant", usually rendered as ~~strike-through text~~

People

* ''S'', the pen name of

Percy Bysshe Shelley Percy Bysshe Shelley ( ; 4 August 17928 July 1822) was one of the major English Romantic poets. A radical in his poetry as well as in his political and social views, Shelley did not achieve fame during his lifetime, but recognition of his achi ...

* "S.", the nickname for

Solomon Shereshevsky Solomon Veniaminovich Shereshevsky (russian: Соломон Вениаминович Шерешевский; 1886 – 1 May 1958), also known simply as 'Ш' ('Sh'), 'S.', or Luria's S was a Soviet journalist and mnemonist active in the 1920s. He ...

(1886-1958), a Russian journalist, mnemonist, and synesthete notable for his unusual memory abilities

Arts and entertainment

Books

* ''S.'' (Dorst novel), written by Doug Dorst based on story by J.J. Abrams * ''S.'' (Updike novel), part of the Scarlet Letter trilogy by John Updike * ''S'' (novel series), a 2005-2006 light novel series * ''

"S" Is for Silence ''"S" Is for Silence'' is the 19th novel in Sue Grafton's "Alphabet" series of mystery novels and features Kinsey Millhone, a private eye based in Santa Teresa, California. In a departure from the series format, this novel is set in alternating ...

'', the nineteenth novel in Sue Grafton's "Alphabet mystery" series, published in 2005

Music

* S, the stage name of singer-songwriter and guitarist

Jenn Champion Jenn Champion, formerly known as Jenn Ghetto, is an American singer-songwriter and guitarist who performs under the name S. She was a member of the now defunct band Carissa's Wierd. Early life Champion grew up in Tucson, Arizona where, in the mi ...

S (group) S (에스) is a South Korean project group consisting of three members: Kangta, Lee Ji-hoon and Shin Hye-sung. The group debuted in 2003, under the SM Entertainment label. After 11 years, they released and promoted another mini-album in 2014. ...

, a short-lived South Korean music group active in 2003 and 2014 * ''S'' (EP), a 2001 EP by Japanese musical duo NaNa * Numbering of Franz Liszt's works according to Humphrey Searle's catalogue

Television

*S, the production code for the 1965 ''Doctor Who'' serial ''

The Time Meddler ''The Time Meddler'' is the ninth and final serial of the second season of the British science fiction television series ''Doctor Who''. Written by Dennis Spooner and directed by Douglas Camfield, the serial was broadcast on BBC1 in four week ...

Comics

* S, the protagonist of ''

Heavy Liquid A heavy liquid is a Solution (chemistry), solution or liquid chemical substance with a high density and a relatively low viscosity. Heavy liquids are often used for determination of density in mineralogy, for density gradient centrifugation and fo ...

Automobiles

Production models

* Aion S, a Chinese electric compact executive sedan * Jaguar S-Type (1963), a British sports saloon *

Jaguar S-Type (1999) The Jaguar S-Type is an executive car that debuted at the 1998 Birmingham Motor Show and was marketed by Jaguar for model years 1999-2007, reviving the nameplate of the company's 1963-68 S-Type as a four-door notchback saloon. The S-Type rec ...

, a British executive saloon * Mercedes-Benz S-Class, a German full-size luxury car series *

Mini Cooper S The Mini is a small, two-door, four-seat car, developed as ADO15, and produced by the British Motor Corporation (BMC) and its successors, from 1959 through 2000. Minus a brief hiatus, original Minis were built for four decades and sold during ...

, a British hot hatch *

Neta S The Neta S is a battery-powered mid-size sedan produced by the Chinese electric car company Hozon Auto under the Neta (Nezha) brand, a Chinese all-electric car marque, manufactured by the Zhejiang Hezhong New Energy Automobile Company. History ...

, a Chinese electric sedan *

Tesla Model S The Tesla Model S is a battery-powered liftback car serving as the flagship model of Tesla, Inc. The Model S features a dual-motor, all-wheel drive layout, although earlier versions of the Model S featured a rear-motor and rear-wheel drive ...

, an American electric executive sedan

Prototypes and concepts

Sony Vision-S The Sony Vision-S is an all-electric automobile platform that was developed by Sony, with the first model unveiled at the 2020 Consumer Electronics Show (CES) in Las Vegas as the Vision-S Concept. When the second concept was unveiled in 2022 as th ...

, Japanese mid-size electric concept sedan

Series and trims

Acura Type-S The A-Spec and Type-S marques represent the high-performance divisions of cars produced by Acura Acura is the luxury and performance division of Japanese automaker Honda, based primarily in North America. The brand was launched in the United St ...

, a range of Japanese performance vehicles *

Audi S Audi S and RS models are a range of high performance versions of certain car models of the German automotive company Audi AG. These cars primarily focus on enhanced "sport" performance. Production of Audi "S" cars began in 1990 with the S2 Co ...

, a range of German performance vehicles *

Honda S series The Honda S series is a series of convertible sports cars by Honda. *1962 Honda S360 *1963 Honda S500 *1964–1966 Honda S600 *1966–1970 Honda S800 *1999–2009 Honda S2000 The Honda S2000 is an open top sports car that was manufactured b ...

, series of Japanese sports cars *

Jaguar S Jaguar R and R-S/SVR models are a range of high performance versions of certain car models from the British automotive marque Jaguar Cars, part of parent business Jaguar Land Rover. These cars primarily focus on enhanced "sport" performance. ...

, a range of British performance vehicles

Other uses

Safety (gridiron football position) Safety is a position in gridiron football on the defense. The safeties are defensive backs who line up ten to fifteen yards from the line of scrimmage. There are two variations of the position: the free safety and the strong safety. Their dut ...

South South is one of the cardinal directions or compass points. The direction is the opposite of north and is perpendicular to both east and west. Etymology The word ''south'' comes from Old English ''sūþ'', from earlier Proto-Germanic ''*sunþa ...

on a map or compass, one of the four cardinal directions * s, the SI symbol for

second The second (symbol: s) is the unit of time in the International System of Units (SI), historically defined as of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds ea ...

Shilling (British coin) The British shilling, abbreviated "1/-", was a unit of currency and a denomination of sterling coinage worth of one pound, or twelve pence. It was first minted in the reign of Henry VII as the testoon, and became known as the shilling, from ...

* S postcode area, a postcode area including Sheffield, England * A party label for the

Swedish Social Democratic Party The Swedish Social Democratic Party, formally the Swedish Social Democratic Workers' Party ( sv, Sveriges socialdemokratiska arbetareparti ; S/SAP), usually referred to as The Social Democrats ( sv, link=no, Socialdemokraterna ), is a social-de ...

* Strike (baseball) *

S band The S band is a designation by the Institute of Electrical and Electronics Engineers (IEEE) for a part of the microwave band of the electromagnetic spectrum covering frequencies from 2 to 4 gigahertz (GHz). Thus it crosses the conventi ...

, a band of radio which ranges from 2 to 4 GHz * Sierra, the military time zone code for UTC−06:00 *

Cool S The Cool S (also known as the Stussy S, Super S, Superman S, Universal S, Pointy S, Middle School S, Graffiti S, and by many other names) is a graffiti sign in popular culture that is typically doodled on children's notebooks or graffitied on wall ...

, a graffiti sign