# imaginary unit

> square root of negative one, used to define complex numbers

**Wikidata**: [Q193796](https://www.wikidata.org/wiki/Q193796)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Imaginary_unit)  
**Source**: https://4ort.xyz/entity/imaginary-unit


## References

1. Freebase Data Dumps. 2013
2. ISO 80000-2:2019 Quantities and units — Part 2: Mathematics
3. Quora