Shield: From the Provincial Seal of Ilocos Norte where the town is located.
Gear: Systematic livelihood of the people of San Nicolas.
Tongs & Hammer: Backsmithing and labor.
Jar: Pottery industry which dates back to the Spanish period.
Hide: Tanning and the leather craft.
Water: Irrigation system that produces 2 croppings a year.
Carabao Head: Common work animal; friend of the farmers and agriculture.