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(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
 - <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), 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
 
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, 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)
 - 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
 
See also
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