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