This video dives deeper into the sound "om," and its symbol, the pranava. Have a look:

IN-DEPTH LOOK AT THE PRANAVA/OMKARA:

SRI DESIKACHAR DESCRIBING "OM"

In his book, "Religiousness in Yoga," Krishnamacharya's son, Desikachar describes "Om" as "Ishvara" or "God." Read below:

OM PARVAT

How amazing is this? There's a mountain in India called Om Parvat, where the snowfall settles into the hill-side in the shape of Omkara.

OM-ING IS CALMING

And lastly, watch this sweet father "Om" his baby to sleep

108 OMs

Oh, and if you feel like chanting 108 Oms (a beautiful meditation practice), you can chant along to the video below: