S1, S01, S.I, S-1, S.1, Š-1 or S 1 may refer to:

Biology and chemistry

S1 nuclease Nuclease S1 () is an endonuclease enzyme that splits single-stranded DNA (ssDNA) and RNA into oligo- or mononucleotides. This enzyme catalysis, catalyses the following chemical reaction : Endonucleolytic cleavage to 5'-phosphomononucleotide and ...

, an enzyme that digests singled-stranded DNA and RNA * S1: Keep locked up, a safety phrase in chemistry *

Primary somatosensory cortex In neuroanatomy, the primary somatosensory cortex is located in the postcentral gyrus of the brain's parietal lobe, and is part of the somatosensory system. It was initially defined from surface stimulation studies of Wilder Penfield, and parallel ...

, also known as S1 *

Tegafur/gimeracil/oteracil Tegafur/gimeracil/oteracil, sold under the brand name Teysuno among others is a fixed-dose combination medication used for the treatment of advanced gastric cancer when used in combination with cisplatin, and also for the treatment of head and n ...

, also known as S-1, a chemotherapy medication

Entertainment

* S1 (Indian TV channel), a Hindi-language channel * S1 (Swiss TV channel), a German-language channel * S1 (producer), a hip hop producer, member of the group Strange Fruit Project * S1 No. 1 Style, a Japanese adult video company * Gibson S-1, a guitar made by the Gibson Guitar Corporation * A member of the S1W (group) that later became part of the music group Public Enemy.

Government

* Bill S-1, a pro forma bill in Canadian Parliament * Form S-1, a U.S. Securities and Exchange Commission filing * S-1 Executive Committee, a United States government entity during World War II * S1 (military), an administrative position within military units

Technology

* ACPI S1 power state, in computing; see * Apple S1, integrated computer used in the Apple Watch * Canon PowerShot S1 IS, a 2004 3.2 megapixel digital camera * FinePix S1 Pro, a 2000 interchangeable lens digital single-lens reflex camera by Fujifilm * Nikon Coolpix S1, a digital camera * S1 Corporation, an American software development company * S1 Core, a microprocessor-core * S1 MP3 Player * Samsung Galaxy S (2010 smartphone) * Sendo S1, a Sendo mobile phone model * Siemens S1, a Siemens mobile phone * Sony BDP-S1, a first generation Blu-ray Disc (BD) Player * S1, an Evolved Packet Core, EPC in an LTE/4G network

Transportation

Routes

Austria

* S1 (Vienna), an S-Bahn line * S1, a line of the Carinthia S-Bahn * S1, a line of the Salzburg S-Bahn * S1, a line of the Styria S-Bahn * S1, a line of the Tyrol S-Bahn * S1, a line of the Upper Austria S-Bahn * S1, a line of the Vorarlberg S-Bahn

China

* Line S1 (Beijing Subway) * Line S1 (Nanjing Metro) * Line S1 (Wenzhou Rail Transit) * S1 Yingbin Expressway in Shanghai

Germany

* S1 (Berlin), an S-Bahn line * S1 (Dresden), an S-Bahn line * S1 (Munich), an S-Bahn line * S1 (Nuremberg), an S-Bahn line * S1 (Rhine-Main S-Bahn), an S-Bahn line * S1 (Rhine-Ruhr S-Bahn), an S-Bahn line * S1 (Stuttgart), an S-Bahn line * S1, a Breisgau S-Bahn line * S1, a planned Bremen S-Bahn line * S1, a Hamburg S-Bahn line * S1, a Hanover S-Bahn line * S1, a RheinNeckar S-Bahn line * S1, a Rostock S-Bahn line * S1, a Stadtbahn Karlsruhe line

Italy

* S1a, a Bologna metropolitan railway service * S1b, a Bologna metropolitan railway service * Line S1 (Milan suburban railway service)

Switzerland

* S1 (Bern S-Bahn), an S-Bahn line in the canton of Bern * S1 (RER Vaud), an S-Bahn line in the canton of Vaud * S1 (St. Gallen S-Bahn), an S-Bahn line in the cantons of Schaffhausen, St. Gallen, Thurgau and Zurich * S1 (ZVV), now subsumed by S24, a Zurich S-Bahn line * S1, a line of the Basel S-Bahn * S1, a line of the Chur S-Bahn * S1, a line of the Lucerne S-Bahn * S1, a line of the Zug Stadtbahn

United States

* County Route S1 (California) * S1 (Long Island bus)

Other countries

* S-1 Strategic Highway, Pakistan * Expressway S1 (Poland) * FGC line S1, a suburban train line in Barcelona Province * Stagecoach Gold bus route S1, in Oxfordshire, England, UK

Vehicles

Aircraft

* Blackburn Buccaneer S.1 jet naval strike aircraft * Focke-Wulf S 1, a German Template:Focke-Wulf aircraft, Focke-Wulf aircraft * Fokker S.I, a 1919 Dutch primary trainer aircraft * Hopfner S-1, a Template:Hopfner aircraft, Hopfner aircraft * Letov S-1, a 1920 Czechoslovak surveillance aircraft * Loening S-1, a United States Army Air Service seaplane * Loughead S-1 Sport 1920 US biplane * Martinsyde S.1, a 1914 British biplane aircraft * Pantsir-S1, a Russian anti-aircraft system * Pitts S-1 aerobatic biplane * S-1 Loening, a United States Army Air Service seaplane * SSBS S1, a French experimental rocket * Swift S-1, a 1991 Polish single seat aerobatic glider

Cars

* AS S1 and AS S2, AS S1, a 1927 car manufactured in Poland * Audi S1, performance variant of Audi A1 * Invicta S1, a 2004 sports car * Leapmotor S01, an all-electric car * S1 Scout Car, an armoured car built in Australia during the Second World War * Superformance S1 Roadster, a Lotus Seven Type replicar produced in South Africa 2001–2004 * Saleen S1, an American sports car

Other vehicles

* Alco S-1, a locomotive * PRR S1, a duplex locomotive developed by the Pennsylvania Railroad * LNER Class S1, a class of British steam locomotives * NER Class S1, a class of British steam locomotives * USS S-1 (SS-105), a 1918 United States Navy experimental submarine

Other uses

* S1 (classification), a disability swimming classification * S postcode area covering Sheffield City Centre * in human anatomy: :* the first Sacral vertebrae, sacral vertebra :* the sacral spinal nerve 1 of the vertebral column :* the primary somatosensory cortex in the brain * ''Senior 1'', the First Year in the Scottish secondary education system * Season (television) or series one * Comet Ikeya-Seki, ''C/1965 S1'' * Upplands regemente (signal), a 1902 Signal Regiment of the Swedish Armed Forces

With superscripts and subscripts

S₁ may refer to : * S1 (heart sound), a heart sound in cardiac auscultation S¹ may refer to : * Circle, S¹, the n-sphere in two dimensions i.e. a circle * Inverse second (s⁻¹), a unit of frequency

S01

S01 may refer to : * Akai S01, an :Akai synthesizers, Akai synthesizer * ATC code S01 ''Ophthalmologicals'', a subgroup of the Anatomical Therapeutic Chemical Classification System * HMS Porpoise (S01), HMS ''Porpoise'' (S01), a 1956 Porpoise-class submarine of the Royal Navy * MULTI-S01, an encryption algorithm based on a pseudorandom number generator