It is niraakaara or what is that do not have a shape, as sounds do not have shapes.
The complex letter aum is said to have mystical powers, which is also proven by scientific researches across the world. Also to brig to your notice the word aum is considered to be existing from time unknown, it is considered to be matching with the sound of the great event of our origin of universe - "The BIG BANG".
The three parts of the sound have different meaning and come from different parts of the body.
The part "a" is from the throat, the part "u" comes from the lips and "m' comes from the nose; with the mouth shut.
The chanting of the word goes this way:
- Starting with "a" for few seconds from the root of the throat.
- The part "a" is followed by the part "u" from the inner mouth till the lips for fewer seconds compared to that of "a".
- Then it is followed by a long slow sound "m" comming to rest from the lips to the nose and then ending the whole chant for a long time. This part is streatched a lot as it is the ending which lasts long for a greater period of time dying to scilence.
The sound when chanted for a number of times in this manner will produce psycic vibrations within the body that bgings mystical powers to the whold body and also relaxes the minds of those who chant it as well as listen to it.