# S (disambiguation)

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"
* s, the International Phonetic Alphabet symbol for a voiceless alveolar sibilant sound
* S, the subject of an intransitive verb
* Ѕ, the Cyrillic letter Dze

## Transportation

* S (New York City Subway service), one of the three services:
** Franklin Avenue Shuttle
** 42nd Street Shuttle (also called the Grand Central/Times Square Shuttle) (internally referred to as the 0)
** Rockaway Park Shuttle (also called Rockaway Shuttle) (internally referred to as the H)
* Toei Shinjuku Line, a subway service operated by the Tokyo Metropolitan Bureau of Transportation (Toei), labeled
* Sennichimae Line, a subway service operated by the Osaka Metro, labeled
* , the official West Japan Railway Company service symbol for the Kansai Airport Line.

## Mathematics and logic

* Integral symbol (∫), used in mathematics to denote integrals and antiderivatives
* S combinator in combinatory logic
* Sphere
* S (set theory), an axiomatic set theory
* s(n), the aliquot sum of an integer n

## Physics and chemistry

* Sulfur, symbol S, a chemical element
* s, for second, the SI unit of time
* 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, 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 abbreviated as Ser or S
* 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
* 
, 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), 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
* "S" (song), by Japanese band Sid

### Television

* S, the production code for the 1965 Doctor Who serial The Time Meddler
* The S logo used for Globo’s weekly movie program SuperCine.

### Comics

* S, the protagonist of 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, a 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
* Saviem S, a range of French medium-duty cab-over trucks

## Other uses

* S by Shakira, the first woman's fragrance by Colombian singer songwriter Shakira
* 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)
* Old Israeli Shekel, denominated as S
* 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
* Sierra, the military time zone code for UTC−06:00
* Cool S, a graffiti sign