The lamb and flag motif is a Christian symbol that represents Jesus Christ as the "Lamb of God" who was sacrificed for the sins of humanity. In stained glass windows, this motif is often used to represent the crucifixion of Jesus and his sacrifice for humanity's salvation.

The lamb and flag symbol originates from the Book of Revelation in the Bible, which describes a vision of a lamb standing on a mountaintop with seven horns and seven eyes. This lamb is said to have been slain but is now alive and is worthy of praise and worship. The lamb's sacrifice is seen as an act of atonement for the sins of humanity.

In Christian art and iconography, the lamb is often depicted carrying a flag or banner with a cross on it, which symbolizes the victory of Christ over sin and death through his sacrifice on the cross. This symbol can be seen in many stained glass windows, particularly in churches and cathedrals.

The lamb and flag motif also appears in the heraldry of many churches, religious orders, and countries, where it is often used as a symbol of the Christian faith and the sacrifice of Christ. The lamb and flag symbol serves as a powerful reminder of the central role that Christ's sacrifice plays in the Christian faith and the hope of salvation that it offers to believers.