Padma is one of the four attributes borne by Vishnu in his iconography. It is associated with Vishnu's abode upon water, as well as his role in creation and birth.
Vishnu seated upon a lotus and granting an audience to Parikshit
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