original question: What is the unit of solid angle in measurement system [Non-SI units mentioned in the SI]?
answer: square degree
answer type: Unit of Solid Angle.
auxiliary information: This is a list of units that are not defined as part of the International System of Units, but are otherwise mentioned in the SI, because either the General Conference on Weights and Measures accepts their use as being multiples or submultiples of SI-units, they have important contemporary application worldwide, or are otherwise commonly encountered worldwide.
In the measurement system [Non-SI units mentioned in the SI], what is the unit of solid angle?