2S
2S or 2s may refer to:
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Science
- 2s electron in an atomic orbital
- 2S, a protein-folding intermediate with two disulphide bonds
Transportation
- 2S gondola lift
- 2S, a series of Toyota S engines
- Birdman Chinook 2S, ultralight aircraft
- Southwind Airlines (IATA code), a Turkish airline
Other uses
- Two-spirit, a term used by some indigenous North Americans to describe certain people in their communities who fulfill a traditional third-gender (or other gender-variant) ceremonial role in their cultures
- IIS, a draft status abbreviation for conscription into the United States armed forces