# S5

S5 or S-5 may refer to:

## Science

* Pentasulfur (S$_5$), an allotrope of sulfur
* S$_5$, the symmetric group on five elements
* S5: Keep contents under ... (appropriate liquid to be specified by the manufacturer), a safety phrase in chemistry
* Sacral spinal nerve 5, a spinal nerve of the sacral segment
* S5, the fifth sacral vertebra of the vertebral column, in human anatomy

## Technology
### Electronics

* Canon PowerShot S5 IS, a 2007 8.0 megapixel bridge digital camera
* Coolpix S5, a 6 Megapixels Nikon Coolpix series digital camera
* FinePix S5 Pro, a 2006 digital single lens reflex camera by Fujifilm
* Samsung Galaxy S5, an Android smartphone by Samsung
* Samsung Galaxy Tab S5e, an Android tablet
* Simatic S5 PLC, a programmable logic controller family by Siemens

### Software

* S5 (file format), for defining slideshows
* ACPI S5 power state, of the Advanced Configuration and Power Interface in computing

## Transportation
### Airlines and airports

* Star Air (India) (IATA airline code: S5)
* Shuttle America (IATA airline code: S5)
* Trast Aero, (IATA airline code: S5)
* Bandon State Airport (FAA code: S05)
* Slovenia, International Aircraft Registration Prefixes (ICAO country code: S5)

### Mass-transit lines

S-Bahn
* S5 (Berlin)
* S5 (Munich)
* S5 (Nuremberg)
* S5 (RER Vaud), an S-Bahn line in Switzerland
* S5 (Rhine-Main S-Bahn)
* S5 (Rhine-Ruhr S-Bahn)
* S5 (St. Gallen S-Bahn), an S-Bahn line in Switzerland
* S5 (ZVV), in the cantons of Zürich, St. Gallen and Schwyz in Switzerland
* S5, a Hanover S-Bahn line
* S5, a Stuttgart S-Bahn line
* An alternate name for the Huairou–Miyun line in Beijing
Other lines
* S5, a Stadtbahn Karlsruhe line, Germany
* FGC line S5, a suburban train line in Barcelona Province, Spain

### Roads

* County Route S5 (California), a county route in California, U.S.
* S5 Shanghai–Jiading Expressway in Shanghai, China

### Vehicles

Aircraft
* Rans S-5 Coyote, an ultralight aircraft
* Sikorsky S-5, Igor Sikorsky's first successful aircraft design
* Supermarine S.5, a 1920s British single-engined single-seat racing seaplane
Automobiles
* Audi S5, a German compact executive sports car
* BYD Song, a Chinese compact SUV known as the BYD S5 in Egypt
* Haima S5, a Chinese compact SUV
* Haima S5 Young, a Chinese subcompact SUV
* Huansu S5, a Chinese compact SUV
* JAC Refine S5, a Chinese compact SUV
* Luxgen S5, a Taiwanese compact sedan
Spacecraft
* Saturn V, the rocket used mostly in the Apollo program
Trains
* ALCO S-5, and American diesel switching (shunting) locomotive
* Prussian S 5, an 1894 steam locomotives class; see List of Prussian locomotives and railbuses
Watercraft
* USS S-5 (SS-110), a 1919 S-class submarine of the United States Navy

## Other uses

* S5 (modal logic), in logic and philosophy
* S-5 rocket
* S5 (band), an Indian pop band
* S5 (classification), a disability swimming classification
* British NVC community S5, a swamps and tall-herb fens community in the British National Vegetation Classification system
* Fifth year, in the Scottish education system
* S5, a public affairs officer within military units; see staff
* S5 postcode, in the S postcode area covering areas of northern Sheffield
* S-5 visa, a non-immigrant visa which allows travel to United States for individuals who are witnesses, informants