Tibetan Hindu/Buddhist Shell: "Dung-Dkar"

This is a ritual object that is used in both Hinduism and Buddhism.

In Sanskrit, and Hindu religious practice, the conch shell is called "shankha." It is associated with worship of Vishnu, the god of preservation. Vishnu is always depicted holding the shankha. It is a symbol of water. Hindus believe that blowing into a conch shell creates the sound of the beginning of the universe, "aum." The shankha is also associated with both female fertility and serpents.

"Dung-Dkar" means white shell in Tibetan. The dung-dkar has been used as a part of religious ceremonies throughout the history of religious music in Tibet. The "Bon" shamanistic religion, before Buddhism was introduced to Tibet, used the dung-dkar to invoke and call the spirits to help grow cattle or food. The dung-dkar also was used to banish evil spirits that caused illness and destruction. In Buddhism, the conch shell is one of the eight auspicious symbols.

Nowadays the dung-dkar is mainly found only in Buddhist monasteries and is very rarely used as a secular instrument. The sound of the dung-dkar is a “symbol of the proclamation to the world of Buddhist law”. It is played from the top of monasteries to summon the public to certain ceremonies. The musicians will play the instruments facing towards each of the four points of the compass in turn.
Source:
https://en.wikipedia.org/wiki/Shankha
https://wmic.net/tibet-dung-dkar-applebees/