Sīmiyā’ is an Arabic word that in the dictionaries to use it is usually translated as ‘white magia’ or ‘natural magia’. Indeed, the so-called ‘science of the sīmiyā’ (‘ILM al-sīmiyā’) is a well-known type of magia in the Arab world from the Middle Ages to Nustrody. After briefly discussing the proposed aetimologies for the term, we will set out the definitions that have given to this medieval science by classical authors such as Šhihāb al-Dīn al-Qarāfla (s. XIII), Ibn Jaldūn (s. XIV) or Hāytella Jalīfa (s. XVII), highlighting their diversions.We will also comment on its practice as set out in some texts of old hidden sciences. we will analyse the meaning, basic and practical concepts of the Sīmiyā’ in al-Andalus, based mainly on the work of the author sufí Muhammad b. ‘Alque b. Tū-Andalus al-Andalusla (s. XIII – XIV) entitled KANZ al- ‘ulūm wa-l-durr al-manzūm al-manzūm’, where it devotes a brief chapter to that science, which will lead us to link sufism to the practice of hidden sciences in the Islamic world.