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SO3

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SO3 may refer to

  • Sulfur trioxide, SO3, a chemical compound of sulfur and the anhydride of sulfuric acid
  • Sulfite, SO2−3, a chemical ion composed of sulfur and oxygen with a 2− charge
  • SO(3), the special orthogonal group in 3 dimensions; the rotations that can be given an object in 3-space
  • Star Ocean: Till the End of Time, the third main game in the Star Ocean series
  • A staff officer of the third class, usually a junior officer
  • Special Operations 3 - Planning, of SOE (Special Operations Executive, British, World War II)
  • SO3, a TL9000 metric defined as the number of service impact product-attributable outages per NU (normalization unit) per year