narasimha jayantī is observed on the śuddha trayodaśī of vaiśākha māsa.  It is the date when Lord viṣṇu appears as a half-man half-lion (Narasimha) to protect prahlāda from being killed by his demonic father hiraṇyakaśipu, who was an asura king.  This avatār of Lord viṣṇu represents the balance of power and wisdom, making Lord Narasimha a symbol of strength and courage combined with wisdom.