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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 (Arabic: أحمد البوني المالكي, d. 1225), 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 (Arabic: علم الحروف, the esoteric value of letters) and topics relating to mathematics, siḥr "sorcery", and spirituality.[1][2] Born in Buna in the Almohad Caliphate (now Annaba, Algeria), al-Buni lived in Ayyubid Egypt and learned from many eminent Sufi masters of his time.[3] A contemporary of ibn Arabi,[4] he is best known for writing one of the most important books of his era; the Shams al-Ma'arif, a book that is still regarded as the foremost occult text on talismans and divination.