Om represents the sound of the universe
You know, a researcher from Boston discovered that the frequency of Om is precisely the same as the frequency of the earth's rotation around its own axis after recording the sound and analyzing it on a computer. It's quite fascinating. Om is referred to as one hand clapping sound. Om is the eternal sound; Om is the sound that permeates the cosmos constantly. When saints from the past entered a deep state of meditation, they only heard Om. Om thus has numerous meanings. It connotes love, eternities, chastity, and harmony. Om alone is not employed; Hari Om, Om Namah Shivaya, or another mantra is used in addition to Om. The word "OM" is written differently in texts both domestically and internationally, although the sound is essentially the same worldwide.
Since OM is the sound of the universe and is constantly present, we cannot chant it. Chanting OM won't actually make it exist; instead, it will just create a frequency that is sympathetic to OM's already-existing energy. It is not a made-up chant. Instead, we create a link between ourselves and the Supreme Reality, which takes the shape of the sound vibration OM.