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 (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 transcription, phonetic notation based primarily on the Latin script. It was devised by the International Phonetic Association in the late 19th century as a standa ...

symbol for a voiceless alveolar sibilant sound * S, the

subject Subject ( la, subiectus "lying beneath") may refer to: Philosophy *''Hypokeimenon'', or ''subiectum'', in metaphysics, the "internal", non-objective being of a thing **Subject (philosophy), a being that has subjective experiences, subjective cons ...

of an intransitive verb

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 comput ...

in combinatory logic * Sphere * ''s(n)'', the aliquot sum 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 formula ...

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

, the square of the invariant mass * Siemens (unit), the SI derived unit of electric conductance * S-block 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 nucleus, atomic nuclei. Spin is one of two types of angular momentum in quantum mechanics, the other being ''orbital angular moment ...

* s, an abbreviation for solid

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 − form un ...

, 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 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 achie ...

* "S.", the nickname for Solomon Shereshevsky (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, S. She was a member of the now defunct band Carissa's Wierd. Early life Champion grew up in Tucson, Arizona where, in the ...

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

, 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''

Comics

* S, the protagonist of '' Heavy Liquid''

Automobiles

Production models

* Aion S, a Chinese electric compact executive sedan *

Jaguar S-Type (1963) The Jaguar S-Type is a saloon car produced by Jaguar Cars in the United Kingdom from 1963 to 1968. Announced 30 September 1963 it was a technically more sophisticated development of the Mark 2, offering buyers a more luxurious alternative without ...

, a British sports saloon * Jaguar S-Type (1999), a British executive saloon * Mercedes-Benz S-Class, a German full-size luxury car series * Mini Cooper S, 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, 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, a range of Japanese performance vehicles * Audi S, a range of German performance vehicles * Honda S series, series of Japanese sports cars * Jaguar S, a range of British performance vehicles

Other uses

* Safety (gridiron football position) * South on a map or compass, one of the four cardinal directions * s, the SI symbol for second * Shilling (British coin) * S postcode area, a postcode area including Sheffield, England * A party label for the Swedish Social Democratic Party * Strike (baseball) * S band, a band of radio which ranges from 2 to 4 GHz * List of military time zones#S, Sierra, the military time zone code for UTC−06:00 * Cool S, a graffiti sign