I'm looking for the name of a specific name of a UX convention.
Many games, to allow for multiplayer games without logging in, let you share a unique URL that when another person visits, will create a privately shared game. I have seen this many times in other applications where not creating an account and private sharing are key.
Does this have a name? If not, I think it should as it an extremely useful solution to an interesting problem for users looking to balance privacy (in terms of not needing to create another account), speed (dead simple to setup), and security (they know exactly who is on the receiving end).
Here are a few examples:
Above: Cubeslam. Below: lichess.