Nepalese Hindu Holy Symbol - "Aum"

The “aum” symbol represents the universe in Hinduism. It is the most important Hindu symbol. At the dawn of creation, from emptiness emerged the first sound of creation, the syllable consisting of three letters – A-U-M. It is often written as OM.

AUM is the root mantra, a word of great power. A mantra is recited loudly and repeated as an invocation or prayer. Aum represents the three aspects of God: the Brahma (A), the Vishnu (U) and the Shiva (M). This symbol also represents Brahman, creative force of the universe.

Hinduism is the oldest living religion, about 4,000 – 5,000 years old. Hindu people believe that Brahman is the creator, preserver and transformer of existence. Gods that are part of Brahman include Vishnu, the preserver god, and Shiva, the god of destruction. Hinduism came from India. No one person founded the religion. There are many Hindu holy books. Hindus honor their deities through worship. Hindus tell stories of the ways that the gods interact with each other and with humans. Hindus believe in rebirth after death (reincarnation); their goal is to escape the movement of the soul into another body and to become one with Brahman.

Source:
https://www.palomar.edu/pages/mcastillo/india-mystic-and-historic/aum-symbolic-meaning/#:~:text=The “AUM” symbol (or,(often written as OM).
https://www.lotussculpture.com/my_articles_om.html