Question

What is the degree after phd?

Answer 1

In France (and other countries, I believe), there is a qualification called a habilitation, which comes after thePhD, but isn't a degree per se. ... Higher doctorate degrees are awarded by some universities in some countries

Answer 2

A postdoc is simply a research position that is not permanent, i.e. no fixed contract or tenure. There are some exceptions, for example in the German system where you can get yourHabilitation, which is a degree after you get your PhD. But in most systems there is nothing beyond a PhD in terms of degrees.