SO or so may refer to:

Arts and entertainment

Music

Other

Relationships

Businesses

Language

Places

Science, technology, and mathematics

Biology

Computing

Mathematics

  • SO (complexity), second-order logic in descriptive complexity
  • Special orthogonal group, a subset of an orthogonal group
    • SO(2), a term used in mathematics, the group of rotations about a fixed point in the Euclidean plane
    • SO(3), a term used in mathematics, the group of rotations about a fixed point in three-dimensional Euclidean space
    • SO(4), a term used in mathematics, the group of rotations about a fixed point in four-dimensional Euclidean space
    • SO(5), a term used in mathematics, the special orthogonal group of degree 5 over the field R of real numbers
    • SO(8), a term used in mathematics, the special orthogonal group acting on eight-dimensional Euclidean space

Physics and chemistry

Names

Other uses

See also

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