How does angular handle @ sign in view path?

I am looking at datalake aws sources. Their package.js contains:

'@package': {
    templateUrl: 'package/package.html',
    controller: 'PackageCtrl'
}

How does angularjs handle the @package? If it is needed to point controller to package path they can just define package without @, no?

UPDATED

The url when this controller works is http://127.0.0.1:8000/#/package/someId