## Function: COMMON-LISP:PHASE
[![package](https://img.shields.io/badge/Package-COMMON--LISP-5f9ea0.svg?style=social&colorA=999999)](../) [![type](https://img.shields.io/badge/Type-Function-5f9ea0.svg?style=social&colorA=999999)](../#function) [![clhs](https://img.shields.io/badge/CLHS-PHASE-5f9ea0.svg?style=social&colorA=999999)](http://www.lispworks.com/documentation/HyperSpec/Body/f_phase.htm) [![github](https://img.shields.io/badge/GitHub-View_the_source-5f9ea0.svg?style=social&colorA=999999&logo=github)](https://github.com/sbcl/sbcl/blob/master/src/code/irrat.lisp/) 

> Return the angle part of the polar representation of a complex number.
> For complex numbers, this is (atan (imagpart number) (realpart number)).
> For non-complex positive numbers, this is 0. For non-complex negative
> numbers this is PI.

### Lambda list
```cl
(number)
```