Blue Circle: Unity with the names of the Municipality and the Province inscribed in it.
Shield: From the Provincial Seal of La Union where the Municipality is located.
Sun with Eight Rays & Three Stars: Eight (8) provinces around Manila that rose against Spain in 1896; Stars as Luzon, Visayas and Mindanao.
Shovels, Gravel & Sand: Gravel and sand industry which is one of the highest revenue-producing industry and most modern in the town.
Sailboat, Fish & Sea: Fishing, one of the major industry of the coastal town.
Rice Fields, Plow & Rice Stalk: Agricultural farming which makes the town "The Rice Granary of the 1st District of La Union."
Forty Roundels: Fourty (40) Barangays of Luna.