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SI supplementary unit
SI (International System of Units) supplementary units are:
| 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.
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