Panchajanya is the shankha (conch) of the Hindu preserver deity Vishnu, one of his four primary attributes. The Panchajanya symbolises the five elements, and is considered to produce the primeval sound of creation when blown.
Iconography of the Panchajanya on a temple wall
Krishna blows the Panchajanya to signal the end of the Kurukshetra War, Razmnama
A shankha has religious ritual importance in Hinduism.
Carved conches or Vamavarta shankhas, c. 11–12th century, Pala period, India: The leftmost one is carved with the image of Lakshmi and Vishnu, and has silver additions.
A shankha, 19th century
A Shankha (conch shell) with Vishnu emblem carved
Hindu priest blowing a shankha during a puja