An object that is governed by a room means its ACL is ruled by the room, and only the room’s members can access it. While a governed object may be linked to other locations in a repository, the only users who can access it are members of the room that governs the object. A room governs anything created within or imported into it except for another room.
Accessors for the Contributors and Owners roles, and local groups, are added to its ACL according to the defaults set in the room’s Properties: Options tab. An object created by copying another counts as a new object.
In the optional Room column of a list (indicated by the 
icon), objects that belong to rooms are distinguished by one of the following icons (or governing indicators):
means the item belongs to (or is governed by) the same room as the current folder.
means the object belongs to a different room.
Clicking a governing indicator opens the room’s home page. Click the header icon to sort a list of objects according to whether they belong to the same room, a different room, or no room (no icon in the Room column).
If you show all versions in a folder, each version of an object that is visible to you has its own governing indicator since it is possible for different versions to belong to different rooms.
You can turn off the Room column by using Display Setting preferences for columns.