The lamb holds a flag.
Christ often associated Himself with a lamb. Sometimes He was the good shepherd, who would leave the ninety and nine to find the one lamb lost in the Wilderness.
Often, though, Christ is the white lamb of God, innocent of any sin, destined to be the sacrifice on the altar to purify our sins. The white lamb often supports a flag. Sometimes the flag has a crown of thorns, for the crucifixion. The flag itself represents Christ’s victorious battle over death.