The personal coat of arms of Bishop Michael Sis features a basket containing five loaves of bread, with two fish, one above and one below the basket. Rooted in ancient Christian iconography, it recalls the miracle of the multiplication of the loaves and fishes, the only miracle story recorded in all four Gospels.

Just as he did on the shore of the Sea of Galilee, Jesus continues to take our seemingly insufficient resources, miraculously multiplies them through the power of his grace, and utilizes them to meet the spiritual and material needs of his people.

The gold Cross above the shield is the Celtic Cross, which has a ring surrounding the intersection. The circle is a symbol of eternity, since Jesus Christ is the eternal Son of God. It illustrates the endlessness of God's love poured out in Christ's sacrifice on the Cross. The five gems represent the five wounds of Christ.

For his motto, Bishop Sis has selected the phrase "DEI SUMUS ADIUTORES." This Latin phrase, from Saint Paul's First Letter to the Corinthians (1 Cor. 3:9), is translated in English as "We are God's co-workers" and in Spanish as "Somos colaboradores de Dios." It expresses the profound biblical truth that God calls us to cooperate with him in his action in the world.