Aflac's modern brand identity was born after the insurance company’s ad team made a striking discovery nearly two decades ago: The sound “Aflac” resembles “quack quack.” The symbol debuted on Jan. 1, 2000 (yes, Y2K), and the rest is history. Since that time, the Aflac duck has become an advertising icon, signifying the company’s commitment to best business practices, philanthropy and corporate social responsibility (CSR).