How much "field of view" is covered by a surface or object from a point.

Solid angle is measured in steradians (much like angles are measured in radians).

The solid angle covering

Its symbol is Ω

Solid angle is measured in steradians (much like angles are measured in radians).

The solid angle covering

**all directions**(i.e. a full "field of view") is 4π steradians.Its symbol is Ω

See: Steradian

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