Until 1995, SI (International System of Units) supplementary units were:
| Quantity | Symbol | Name of SI supplementary unit | Symbol for SI unit
|
|---|
| angle | θ | radian | rad
|
| solid angle | Ω | steradian | sr
|
As of October 1995, the category of "supplementary units" has been abolished from the SI system of measurement, and the radian and the steradian are now considered SI derived units.
See also