I have a star, system icon what is this?

[AC Question]

a white star at the top right hand side of the screen

 

[Crashdamage]

It's a Priority Interruptions icon. To get it outta there go to:

Settings > Sound & notification > Interruptions > When calls and notifications arrive - change the selection to Always interrupt.

The star should be gone.

Android since v1.0. Linux since 2001.