SO2
SO₂ (also written as SO2) most commonly refers to sulfur dioxide, a chemical compound. SO2 may also refer to other things, including: In science:- Sulfonyl group, a functional group in organic chemistry consisting of a sulfur atom double-bonded to two oxygen atoms
- Staff officer grade 2 (SO2), a mid-level staff position typically held by a major, squadron leader, or equivalent rank
- Royal Air Force rank, equivalent to a squadron leader in staff roles
- Sonarman second class (SO2), a former U.S. Navy enlisted rating for sonar technicians
- Special Warfare Operator second class (SO2), a U.S. Navy SEAL enlisted rank (E-5)
- Special Operations Group 2, a unit or designation in special operations
- Saab 340 variant, a specific model or configuration of the Saab 340 aircraft
- Dornier Do 228 variant, a specific model or configuration of the Dornier Do 228 aircraft
- Star Ocean 2, a 1998 role-playing video game developed by tri-Ace
- Standard output 2, a computing term referring to the second standard output stream in some programming contexts