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.