The term "John Hancock" refers to the bold signature of John Hancock, an American revolutionary leader and the first signer of the Declaration of Independence. His signature is famously large and flamboyant, symbolizing his strong commitment to American independence from British rule. Today, "John Hancock" is often used colloquially to mean a person's signature. It represents the act of signing a document, especially in contexts where a signature is required to validate agreements or contracts. The phrase has become a cultural reference in discussions about personal endorsement and commitment.