Tahleeq (تحلیق) refers to the act of shaving or trimming the head as a ritual during Islamic pilgrimages, particularly Hajj and Umrah.

Quranic Reference:

"You will surely enter the Sacred Mosque (Masjid al-Haram), if Allah wills, in safety, with your heads shaved and [hair] shortened."

— Surah Al-Fath (48:27)