The Three (3) major symbols of the Coat of Arms represent the three jurisdictions that comprise the Diocese of Kalookan; namely:
* The Monument at the very center represents Caloocan City from which the name of the Diocese was derived;
* The Fishes on the right represent the City of Malabon; and
* The Banca on the left represents the Municipality of Navotas.
The red color of the lower half of the insignia symbolizes not only the valor of martyrdom of our Philippine heroes with which Kalookan is noted for, but, more importantly, the sanguine ardor, fortitude and love of the Diocese of Kalookan in the fulfillment of her mission.
The blue color of the upper half of the insignia denotes the Marian Character of the diocesan ministry.
The Cross on the top of the insignia signifies the centrality of Jesus Christ in the life and function of the entire Diocese of Kalookan while the dove, hovering above the monument, represents the Holy Spirit sanctifying the lives of the People of God – the bishop, priests, religious men and women and the laity – in the new diocese.
The theme, the latin words: “DUC IN ALTUM” (Lk. 5:4) – “put out into the deep” – binds together all the elements of the insignia and captures the spirit and direction of the Diocese of Kalookan in the Third Christian Millennium.