What is meaning of "::" syntax in Laravel Blade (Ex: @include('googletagmanager::head') )?

When I used Laravel Package: spatie/laravel-googletagmanager , in my view included view include some view of package

 @include('googletagmanager::head')

What is meaning of :: syntax ?
Where can I find reference document about it ?
When ScriptViewCreator is called ( vendor/spatie/laravel-googletagmanager/src/ScriptViewCreator.php ) ?

Thank you!

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