Why do Hindus use the um symbol?

Hindus use the "Om" symbol as a sacred sound and spiritual icon that represents the essence of the universe and the ultimate reality, known as Brahman. It is often chanted during meditative practices, prayers, and rituals to promote spiritual connection and harmony. The symbol embodies the three states of consciousness—waking, dreaming, and deep sleep—along with the fourth state of transcendental consciousness. Overall, "Om" serves as a powerful reminder of the interconnectedness of life and the divine.