Answer
**Answer: Son of kyai.** Gus Dur, or Abdurrahman Wahid, was the fourth president of Indonesia and a prominent Muslim leader. The title "Gus" is an abbreviation of "Gusti", a Javanese honorific used for male descendants of kyai, or Islamic scholars. Kyai is a term of respect for Muslim religious teachers or leaders in Indonesia, particularly those who are knowledgeable in Islamic law and teachings.