Abū Maʿshar al-Balkhī conducting an astronomical experiment, from Kitab al-Bulhan, MS. Bodl. Or. 133, fol. 34r. Bodleian Libraries; image released under CC BY 4.0 via…
What is ʿilm al-ḥurūf, the Arabic “science of letters”? This evidence-based guide explores abjad numbers, divine names, magic squares, talismanic writing, Aḥmad al-Būnī, the complicated…