An item's full name consists of the module name, a :: symbol, and then the item's short name. If we have several layers of modules that we need to get through before we find the item we want, we list those modules' names in order, with a :: between each name. For example, we might refer to std::path::Path to get the Path item from the path module of the std module.

We can use the full name anywhere and be completely unambiguous as to what item we're talking about.