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 * ''s(n)'', the aliquot sum of an integer n

Physics and chemistry

* Sulfur, 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 Chirality_(chemistry)#Stereogenic centers, ''R''/''S'' system * ''s'', one of the Mandelstam variables, 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) * s, an abbreviation for solid

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

Arts and entertainment

Books

* S. (Dorst novel), ''S.'' (Dorst novel), written by Doug Dorst based on story by J.J. Abrams * S. (Updike novel), ''S.'' (Updike novel), part of the John Updike bibliography, Scarlet Letter trilogy by John Updike * S (novel series), ''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), ''S'' (EP), a 2001 EP by Japanese musical duo NaNa * Numbering of List of compositions by Franz Liszt, 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 (comics), Heavy Liquid''

Automobiles

Production models

* Aion S, a Chinese electric compact executive sedan * Jaguar S-Type (1963), 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, a Chinese electric sedan * Tesla Model S, an American electric executive sedan

Prototypes and concepts

* Sony Vision-S, 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