The sound of the Shankha plays an important role when something significant begins in Sanatana Dharma (Hindu Dharma) and Buddhism. Shankha represents luster, brilliance, purity, and auspicious start. It is viewed as a devout article and is utilized in all religious ceremonies.
It is widely believed that the first use of the Shankha took place during the Samudra Manthan or churning of the ocean. Legends have it that it was used and remained an object of benefaction during Samudra Manthan. Shankha is closely associated with Lord Vishnu and Goddess Lakshmi. Lord Vishnu is usually portrayed holding a conch shell. It is believed that during the Samudra Manthan, the first conch shell appeared and it was followed by Goddess Lakshmi, as per an article on VedicFeed. Accordingly the blowing of sankha during dawn implied that war was on and again it used to be blown at nightfall meaning retreat to the camps of night rest.