The scripture Mandukya Upanishad describes how AUM, or "OM," is the basis of all another letters inside the Sanskrit language and is linked to the universe plus the human microcosm (analgous principles exist in these kabalistic is effective because the Sepher Yesirah). A mantra may be connected with a yantra, https://damienhkjgc.blogdigy.com/the-basic-principles-of-kali-56700937