steradian
  • noun the supplementary SI unit of measurement for solid angle.
  • Unit of solid angular area, e.g. on the celestial sphere, consisting of a square one radian (angular measure) on a side
  • A unit of measure of solid angles. There are 4π steradians in a sphere, thus one steradian equals about 0.079577 sphere. Its symbol is sr.
  • abbreviation sr

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