I would assume he means this: https://www.ue-germany.com/news-centre/blog/what-is-mint-any...

  Careers and academic disciplines in the fields of:
  Mathematik (Mathematics)
  Informatik (Computer Science)
  Naturwissenschaften (Natural Sciences)
  Technik (Technology)

but it's honestly first time I'm seeing this too, might be just a German thing.