solid angle unit
steradian
"A solid angle unit which is equal to the solid angle subtended at the center of a sphere by an area on the surface of the sphere that is equal to the radius squared." [NIST:NIST]
sr
steradian based unit
steradian
"A solid angle unit which is equal to the solid angle subtended at the center of a sphere by an area on the surface of the sphere that is equal to the radius squared." [NIST:NIST]
sr