The holy Hindu syllable "Om" is said to encapsulate the Supreme knowledge; one who knows the profoundest meaning of Om is indeed a Gyani who knows the Supreme Truth. According to mythology, Murugan, even as a little boy was aware the meaning of Om.
The Mystical Secret of Pranava MantraMurugan is frequently is represented with youthful appearance. His vehicle is the peacock which represents Infinite Light, and his flag has rooster on the banner which represents Infinite Sound. When the Infinite Light and Infinite Sound merge together then a powerful vibration (hmmm) will emerge called pranava mantra. The whole creation,preservation and destruction that happens in the Universe and within our self are hidden behind this Infinite Light + Infinite Sound = Pranava Mantra theory. Once the right Guru find you then he will disclose the secrets behind this theory to enlighten you. ~ Vijayakumar Alagappan
Once lord Brahma, the creator of the Universe, out of egotism, failed to show due respect to Lord Murugan, who was then a little boy. Murugan cornered Lord Brahma to expound the meaning of Om to him and the later could not do it. Murugan imprisoned him citing his incompetence.
Since Murugan thus became a saint who taught to the very lord of the universe, he was called Swaminathan. In Tamil, he is hailed as "Thagappan Sami" - one who became a Guru to his own father.
Murugan is incarnation of Lord Brahma, Lord Vishnu, Lord Shiva, Goddess Saraswathi, Goddess Lakshmi and Goddess Gowri having the power of all the six Gods mentioned above and gives Knowledge, Money, Potency, and the Power to succeed in any good endeavor.