Why is OM or AUM considered a magical word?

Question

Why is OM or AUM considered a magical word?

Answer 1

"Aum (also Om) is a mystical or sacred syllable in the Hindu, Jain and Buddhist religions. It is placed at the beginning of most Hindu texts as a sacred exclamation to be uttered at the beginning and end of a reading of the Vedas or previously to any prayer or mantra and also is said in the beginning of any puja (religious ritual). The Mandukya Upanishad is entirely devoted to the explanation of the syllable."

Answer 2

It is not "magical" it is called a "mantra" or a meaningless syllable that you pronounce over and over until you clear your brain of all thoughts.  It is a meditative type of word for the Buddhists and other Eastern religions