The Mool Mantra (also spelt Mul Mantra) is the most important composition contained within the Sri Guru Granth Sahib, the holy scripture of the Sikhs; it is the basis of Sikhism. The word "Mool" means "main", "root" or "chief" and "Mantar" means "that which supports or protects". Image: The Mool Mantra in Gurumurki script