$document

<div ng-controller="ExampleController">
  <p>$document title: <b ng-bind="title"></b></p>
  <p>window.document title: <b ng-bind="windowTitle"></b></p>
</div>

angular.module('documentExample', [])
.controller('ExampleController', ['$scope', '$document', function($scope, $document) {
  $scope.title = $document[0].title;
  $scope.windowTitle = angular.element(window.document)[0].title;
}]);