The dove is a symbol for the Holy Spirit, purity, peace. With the Holy Spirit inside of us we have Victory over death!
For Noah, the dove carried the olive branch to show him the flood waters had abated. There was peace on earth again.
When Jesus was baptized the Holy Spirit descended like a dove, & God said, “This is my beloved Son, whom I love; with him I am well pleased.” (Matt 3). We have victory in Christ. (1 Corinthians 15:57, Romans 8:37, 2 Corinthians 2:14, Deuteronomy 20:4, Eph 10)