Sharaf al-Din, Shihab al-Din, or Muḥyi al-Din Abu al-Abbas Aḥmad ibn Ali ibn Yusuf al-Qurashi al-Sufi, better known as Aḥmad al-Būnī al-Malki, was a medieval mathematician and Islamic philosopher and a well-known Sufi. Very little is known about him. His writings deal with 'Ilm al-huruf and topics relating to mathematics, siḥr (sorcery) and spirituality. Born in Buna in the Almohad Caliphate, al-Buni lived in Ayyubid Egypt and learned from many eminent Sufi masters of his time.

Annaba, formerly known as Bon, Bona and Bône, is a seaport city in the northeastern corner of Algeria, close to the border with Tunisia. Annaba is near the small Seybouse River and is in the Annaba Province. With a population of about 464,740 (2019) and 1,000,000 for the metropolitan area, Annaba is the third-largest city and the leading industrial center in Algeria.