S9

S9 can be:

• Rail transport
  • S9 (Berlin), a S-Bahn line
  • S9 (Rhine-Ruhr S-Bahn), a Rhein-Ruhr S-Bahn line
  • a Rhine-Main S-Bahn line
  • S9 (ZVV), a S-Bahn line in the cantons of Zürich and Zug in Switzerland
  • a Stadtbahn Karlsruhe line
  • Prussian S 9, a 1908 German steam locomotive class

• Other transportation terms
  • SIAI S.9, a 1918 Italian flying boat
  • USS S-9 (SS-114), a 1920 S-class submarine of the United States Navy
  • East African Safari Air IATA airline designator
  • County Route S9 (California)
  • Rans S-9 Chaos, light aerobatic aircraft

• Other meanings
  • S9 fraction, a postmitochondrial liver fraction
  • S9: Keep container in a well-ventilated place, a safety phrase in chemistry
  • S9 postcode, covering areas of north eastern Sheffield
  • S9, the Portable media player of Cowon which electronics company in South Korea
  • British NVC community S9, a swamps and tall-herb fens community in the British National Vegetation Classification system
  • Motorola S9, a Bluetooth stereo headset
  • A slang term used in CB radio to refer to excellent reception. Also, S9 was a magazine published from 1962 to 1982 in the United States devoted to CB radio
  • Sometimes the filename extension for Motorola S-records

S09 may refer to :

• HMS Oberon (S09), a 1961 British Royal Navy Oberon-class submarine
• Brave Fire S09, an Osamu Tezuka anime

S₉ may refer to :

• a cyclic allotrope of sulfur (or sulphur)