A steradian.
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A solid angle, measured from a vertex, is the ratio between the area subtended by the angle at the vertex and the the square of the distance to the vertex. The unit of measurement is the stradian.
The SI unit for measuring solid angles is a steradian : the stereo version of the 2-dimensional unit, the radian. The maximum value of a 3-d angle is 4*pi steradians which is approx equal to 41253 degrees.
it is same as surface and volume ! a plane angle is 2D and solid angle is 3D
It is a solid angle, or an angle in 3-d space.
centimeters