Definition that contains solid angle
- sr the unit of solid angle adopted under the Systeme International d'Unites
- lm a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions
- lumen a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions
- steradian the unit of solid angle adopted under the Systeme International d'Unites
- truncation the replacement of an edge or solid angle (as in cutting a gemstone) by a plane (especially by a plane that is equally inclined to the adjacent faces)