Om is regarded as the syllable of the supreme Reality and is sometimes called "the mother of mantras." It is often found at the beginning of prayers, mantras, and scriptures as a word of invocation and adoration. Buddha is not a personal name but an epithet of those who have achieved enlightenment, the goal of the Buddhist religious life. Buddha comes from the Sanskrit root ‘budh’, meaning to awaken, and the Buddhas are those who have awakened to the true nature of things as taught in the Four Noble Truths.