# complex sign function

> complex-to-complex function which takes a number and returns its "direction" in the form of a number on the complex unit circle, or zero

**Wikidata**: [Q105356164](https://www.wikidata.org/wiki/Q105356164)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Complex_signum_function)  
**Source**: https://4ort.xyz/entity/complex-sign-function


## References

1. ISO 80000-2:2019 Quantities and units — Part 2: Mathematics