Honorifics are words that connote esteem or respect when used in addressing or referring to a person. In the German language, honorifics distinguish people by age, sex, profession, academic achievement, and rank. In the past, a distinction was also made between married and unmarried women.
As with the title of Doctor in English, Doktor applies both to medical doctors and those who hold a doctorate. Unlike the English-language usage, Doktor may be repeated for double doctorates (Doktor Doktor). It can also be combined with other honorifics (Herr Doktor or Frau Doktor Doktor).