Om is definitely the essence of the whole development. Om is the best mantra that has anything. And after that Om expanded and became Gayatri. Gayatri isn't a goddess getting 5 faces and seated with a lotus. The Mantra includes the essence in the Vedas. It's really a common prayer https://clayton37047.blog2freedom.com/31049368/the-basic-principles-of-gyatri-mantra