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 "poſ ...

(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 The integral symbol: : (Unicode), \displaystyle \int (LaTeX) is used to denote integrals and antiderivatives in mathematics, especially in calculus. History The notation was introduced by the German mathematician Gottfried Wilhelm Leibniz in 1 ...

(∫), used in mathematics to denote integrals and antiderivatives * S combinator 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 th ...

* ''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, 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 thermodynam ...

* S, a non-SI unit used to designate molecule size named after the

Svedberg A Svedberg unit or svedberg (symbol S, sometimes Sv) is a non- SI metric unit for sedimentation coefficients. The Svedberg unit offers a measure of a particle's size indirectly based on its sedimentation rate under acceleration (i.e. how fast a ...

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 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-bl ...

of the periodic table, which includes alkali metals, alkaline earth metals, and hydrogen and helium * Spin (physics) * 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 structural ...

Biology and medicine

* Serine, a standard amino acid abbreviation * ATC code S ''Sensory organs'', a section of the Anatomical Therapeutic Chemical Classification System * S phase 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), an environment for statistical computing and graphics * <s>, the opening tag for the HTML element 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 * "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 w ...

(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'', 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 * S (group), 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 ...

Comics

* S, the protagonist of ''

Heavy Liquid A heavy liquid is a 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 for separating mixtu ...

Automobiles

Production models

Aion S The Aion S is a compact electric sedan produced by Aion, a marque of GAC Group. It was revealed at Auto Guangzhou of 2018. A new variant, the Aion S Plus, was shown in 2021. Overview The Aion S was unveiled at Auto Guangzhou in November 2018. ...

, 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 The Mercedes-Benz S-Class, formerly known as ''Sonderklasse'' (German for "special class", abbreviated as "S-Klasse"), is a series of full-sized luxury sedans, limousines and armored sedans produced by the German automaker Mercedes-Benz, a div ...

, 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, 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 utilized the Honda Type R, Type R marque for their high-performance division of cars from 1997 to 2001, when they produced the Honda Integra, Ac ...

, 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 C ...

, 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) In baseball, the strike zone is the volume of space through which a pitch must pass in order to be called a strike even if the batter does not swing. The strike zone is defined as the volume of space above home plate and between the batter's kn ...

* S band, 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