S3, S-3 or S03 may refer to:

Entertainment

* ''Si3'' (film), originally titled ''S III'' and also known as ''Singam 3'', the third film in the ''Singam'' franchise * '' Expedition to the Barrier Peaks'', code S3, a 1980 ''Dungeons & Dragons'' adventure module * S3 Plan, a fictitious program in the '' Metal Gear Solid 2: Sons of Liberty'' video game * SABC 3, South African public television channel, stylised as S3

Transportation

Airlines

* Ashland Municipal Airport, FAA Location identifier S03, in Oregon, US * SBA Airlines, IATA code S3, based in Caracas, Venezuela

Locomotives

* ALCO S-3, an American diesel switching (shunting) locomotive; see ALCO S-1 and S-3 * NER Class S3, a North Eastern Railway steam locomotive class * Prussian S 3, a steam locomotive

Rail lines

* S3 (Berlin), an S-Bahn line * S3 (Munich), an S-Bahn line in Bavaria, Germany * S3 (Nuremberg), an S-Bahn line in Bavaria, Germany * S3 (RER Vaud), an S-Bahn line in Switzerland * S3 (Rhine-Main S-Bahn), an S-Bahn line in Frankfurt Rhine-Main, Germany * S3 (Rhine-Ruhr S-Bahn), an S-Bahn line in North Rhine-Westphalia, Germany * S3 (St. Gallen S-Bahn), a former S-Bahn line in Switzerland * S3 (ZVV), a line of the Zurich S-Bahn, Switzerland * Line S3 (Milan suburban railway service), commuter rail route in Italy * S3, a Basel S-Bahn line, Switzerland * S3, a Breisgau S-Bahn line, Germany * S3, a Carinthia S-Bahn line, Austria * S3, a Dresden S-Bahn line, Germany * S3, a Hamburg S-Bahn line, Germany * S3, a Hanover S-Bahn line, Germany * S3, a Lucerne S-Bahn line, Switzerland * S3, a Rhein-Neckar S-Bahn line, Germany * S3, a Rostock S-Bahn line, Germany * S3, a Salzburg S-Bahn line, Austria and Germany * S3, a Stuttgart S-Bahn line, Germany * S3, a Styria S-Bahn line, Austria * S3, a Tyrol S-Bahn line, Austria and Italy (South Tyrol) * S3, an Upper Austria S-Bahn line, Austria * S3, a Vienna S-Bahn line, Austria * S3, a Vorarlberg S-Bahn line, Austria and Switzerland

Cars

* Audi S3, a version of the Audi A3 small family car * Bentley S3, a four-door luxury car produced by Bentley from late 1962 until 1965 * Luxgen S3, a sedan produced by Taiwanese-based manufacturer Luxgen starting from 2016 * S3 Roadster, a car produced by South African-based manufacturer Birkin Cars

Roads

* S3 Shanghai–Fengxian Highway, a planned expressway in Shanghai, China * S-3 Strategic Highway, operated by the Pakistan Ministry of Defence; see National Highways of Pakistan (even though it is not actually a National Highway) * Expressway S3 (Poland), a major road in Poland * California County Route S3, from State Route 78 to Borrego Springs over the Yaqui Pass; see California county routes in zone S * S3, a British term for a road with a Suicide lane.

Others

* Stagecoach Gold bus route S3, a bus route in Oxfordshire, England * AJS S3 V-twin, a British motorcycle

Organizations

* Swiss Space Systems (S-3), an aerospace company in Switzerland * S3 Safe Sex Store, an assumed name of Michigan corporation BAK * SThree, a British recruitment agency

Military

* S3 (missile), a French nuclear missile now out of commission * Lockheed S-3 Viking, an American anti-submarine aircraft developed in the 1970s * S.3 Springbok, a British aerial reconnaissance aircraft of the 1920s; see Short Springbok * USS ''S-3'' (SS-107), a U.S. Navy submarine * Norrland Signal Battalion, designation S 3, a Swedish signal unit * S3, the operations officer in military units; see Staff (military)

Science and technology

* Trisulfur, chemical formula (S₃), an allotrope of sulfur * S-phrase 3, also referred to as S3, "Keep in a cool place", a safety phrase in chemistry; see List of S-phrases * British NVC community S3, ''Carex paniculata swamp''; see Swamps and tall-herb fens in the British National Vegetation Classification system

Computing

* S3 Graphics, a computer-hardware company * S3 Group, an Irish software company * S3 Texture Compression, a group of lossy texture compression algorithms * Amazon S3, also known as Amazon Simple Storage Service, an online data-storage service * S3 (programming language), a language used to write the VME operating system and much other system software on the ICL 2900 Series * S3, a standby mode in the Advanced Configuration and Power Interface (ACPI) specification * Snapdragon S3, a Qualcomm ARM system-on-a-chip; see List of Qualcomm Snapdragon systems-on-chip

Electronics

* Canon PowerShot S3 IS, a 2006 digital camera; see Canon PowerShot S * FinePix S3 Pro, a 2004 interchangeable lens digital single-lens reflex camera by Fujifilm * Infinix Hot S3, a smartphone released in 2018 * Nikon S3, a 1953 35 mm film camera * Nikon Coolpix S3, a digital camera * Samsung Galaxy S III, or Samsung Galaxy S3, a smartphone: the successor to the Samsung Galaxy S II ** Samsung Galaxy S III Mini, or Samsung Galaxy S3 Mini, the mini version of the Samsung Galaxy S III * Samsung Galaxy Tab S3, an Android tablet * Samsung Gear S3, a 2016 smartwatch * Samsung YP-S3, often referred to as the Samsung S3, an MP3 Player * Siemens S3, a Siemens Mobile phone

Mathematics

* S₃, the symmetric group of degree 3; see Dihedral group of order 6 * S³, the 3-sphere (a 3-manifold in four-dimensional space)

Medicine and anatomy

* Sacral spinal nerve 3, a spinal nerve of the sacral segment * Third heart sound, or S₃, a rare extra heart sound * ATC code S03, ''Ophthalmological and otological preparations'', a subgroup of the Anatomical Therapeutic Chemical Classification System

Other uses

* S3 Asia MBA, a selective dual-degree, tri-city, tri-university global MBA program * S3 (classification), a classification for swimmers based on their level of disability * Form S-3, a registration form used by the U.S. Securities and Exchange Commission * Postcode district S3, part of the S postcode area of the UK, covering part of Sheffield *

Third year Third or 3rd may refer to: Numbers * 3rd, the ordinal form of the cardinal number 3 * , a fraction of one third * 1⁄60 of a ''second'', i.e., the third in a series of fractional parts in a sexagesimal number system Places * 3rd Street (di ...

, also known as S3, Scottish secondary education for pupils aged about 14 * Junior Secondary Education Assessment, a standardized examination from 1981 to 1987