In Islam, ‘Irfaan (Arabic/Persian/Urdu: عرفان; Turkish: İrfan), also spelt Irfaan and Erfan, literally ‘knowledge, awareness, wisdom’, is gnosis. Islamic mysticism can be considered as a vast range that engulfs theoretical and practical and conventional mysticism and has been intertwined with sufism and in some cases they are assumed identical. However, Islamic mysticism is assumed as one of the Islamic sciences alongside theology and philosophy. Islamic’s mysticism is cognition and knowledge that love has been intertwined through it with structure of revelation in Islam.
Avicenna says in one of his books in definition of mystic as: the one that doesn't allow himself physical pleasures and overlooks this carnal world's pleasures is called "ascetic". The one that observes saying prayers and fasting, etc. is called "worshiper". The one that prevents his conscious from paying attention to the others but God and directed it to the transcendent world to be enlightened by God's light is known as "mystic". However, sometimes two or all these designations can be applied to a single person.