A Liberty pole is a tall flagstaff planted in the ground, often surmounted by an ensign or a liberty cap (see Phrygian cap).
A liberty pole was often erected in town squares during the American revolution (Newport, RI, Concord MA, Savannah, GA, New York City, NY). When an ensign was raised (usually red), it would be a calling for the Sons of Liberty or townspeople to meet and vent or express their views regarding the British rule. The pole was known to be a symbol of dissent against Great Britain.
The symbol is also apparent in many seals and coat of arms as a sign of liberty, freedom, and independence.