It looks somewhat like the number three. It is also often drawn resembling the symbol for a heart. The word made flesh. Om is included in many chants and is supposed to emphasize balance or enhance the meaning and power of the chant. This particular chant is used in many ways.
Any word spoken with clear realization and deep concentration has a materializing value.
Namaste, Om Shanti. Become one with all your potential. Realize this oneness with others.