I’m a bit confused about this. Does being promoted to professor in one institution mean you can call yourself professor forever even if you move/lose your job/leave academia. What if you get appointed elsewhere at a lower grade?
I know at my place, there are people who’ve been promoted based on internal service/leadership more than eg significant contribution to their field of research. But once they have the title, there’s no way to tell that!
I know you can be eméritas but you have to apply for that status at our place as well so that’s not automatic, and is just if you’ve retired.