S1

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

Biology and chemistry

S1 nuclease, an enzyme that digests singled-stranded DNA and RNA
S1: Keep locked up, a safety phrase in chemistry
Primary somatosensory cortex, also known as S1
Tegafur/gimeracil/oteracil, 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 Advanced Configuration and Power Interface § Global states
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 EPC in an LTE/4G network

Transportation

Routes

China

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
a planned Bremen S-Bahn line
a Hamburg S-Bahn line
a Hanover S-Bahn line
a RheinNeckar S-Bahn line
a Rostock S-Bahn line
a Stadtbahn Karlsruhe line

Spain

FGC line S1, a suburban train line in Barcelona Province
S1a (Bologna metropolitan railway service)
S1b (Bologna metropolitan 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 canton of St. Gallen
S1 (ZVV), now subsumed by S24, a Zürich S-Bahn line

United States

Other countries

S1 (Vienna), an S-Bahn line in Austria
Line S1 (Milan suburban railway service), Italy
S-1 Strategic Highway, Pakistan
Expressway S1 (Poland)
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 Focke-Wulf aircraft
Fokker S.I, a 1919 Dutch primary trainer aircraft
Hopfner S-1, a 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, 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 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 :

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