The Lamb of God: Christ symbolized as a lamb, often haloed and carrying a cross or banner, a frequent motif in church relief and liturgical art.
Agnus Dei, “Lamb of God,” is a symbolic representation of Christ as a lamb. The lamb may bear a cross, a cross-staff with banner, a halo, or a chalice receiving blood. The motif occurs on altars, portals, capitals, liturgical vessels, seals, and funerary sculpture.
Etymology
Latin Agnus Dei, “Lamb of God.”
Sculptor Notes
The lamb must remain readable both as animal anatomy and as symbol. A sculptor should avoid reducing it to a generic sheep; the pose, cross, halo, and placement within a medallion or mandorla usually carry the theological identity.
References
https://www.metmuseum.org/art/collection/search/470771