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 Տ, the Armenian letter tyun Ⴝ, the Georgian Asomtavruli letter ch'ari == 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 Shrirangapattana railway station (Indian Railways station code: S), Karnataka, India Karjat railway station (Mumbai Suburban Railway station code: S), Maharastra, India Bojonegoro, Mojokerto, Tuban, Lamongan and Jombang (vehicle registration prefix S) == 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 S-matrix for how a particle physics system works under a scattering process.