Shield: From the Provincial Seal of Isabela where the town is located.
Green Lines: Verdant fields of Naguilian.
Carabao Head: Main work animal for crop production.
Laurel Leaves: Unity of the people of Naguilian especially among Ilocanos and Ibanags.
Corn & Tobacco Plants: Principal products of the Municipality.
"Señal Ti Ili": "Official Seal of the Municipality" in Ilocano and Ibanag dialects.
1896: Year when Naguilian was established as an independent Municipality by the Royal Order from the King of Spain.