# radian

> SI unit of angular measure

**Wikidata**: [Q33680](https://www.wikidata.org/wiki/Q33680)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Radian)  
**Source**: https://4ort.xyz/entity/radian


## References

1. Dimensionless units in the SI
2. ISO 80000-1: Quantities and units—Part 1: General
3. SI Brochure (9th edition)
4. ISO 80000-1:2009 Quantities and units—Part 1: General
5. SI Brochure (9th edition): Concise summary
6. Freebase Data Dumps. 2013
7. Quora
8. Logopedia
9. ISO 80000-3:2006 Quantities and units — Part 3: Space and time
10. International Electrotechnical Vocabulary
11. Recommendation N. 20 - Codes for Units of Measure Used in International Trade - Revision 13 (Annexes I to III)
12. GF WordNet