SO2

SO₂ may refer to:

Look up so2 in Wiktionary, the free dictionary.

In science:

• Sulfur dioxide (SO₂), an oxide of sulfur, a chemical compound
  • to a Sulfonyl group (R-SO₂-R)
• The special orthogonal group of degree 2
• oxygen saturation (SO₂), in medicine of blood oxygenation
• S2 (star), aka SO-2, is the name of a star near the central black hole at the center of the Milky Way galaxy that takes 16 years to orbit that black hole.
• 2015 SO₂, an Aten asteroid in a horseshoe orbit co-orbital with Earth

It may also refer to:

• A staff officer of the second class, often a commissioned officer of lieutenant commander, major or squadron leader rank
• A London Metropolitan Police Specialist Operations command division
• Special Operations 2 – Operational, of SOE (Special Operations Executive, British, World War II)
• Star Ocean 2, a video game
• SO2 (album), a 2010 album by Shinichi Osawa
• An abbreviation of "Shout-out to"