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Scalar may refer to:

  • Scalar (mathematics), a quantity that can multiply vectors in the context of vector spaces
  • Scalar (physics), a quantity that is independent of specific classes of coordinate systems
  • Lorentz scalar, a quantity in the theory of relativity which is invariant under a Lorentz transformation
  • Variable (computing), or scalar, an atomic quantity that can hold only one value at a time

See also[edit]