Answer:
Throughout much of their tenure as the Highlanders, the logo was variations of a stylized N and Y, which lay separately on either side of the jersey's breast. In 1905, the two locked for one season, but not in the way used today. It wasn't until 1909 that the team changed to the familiar interlocking NY (originally designed by Tiffany & Co. in 1877, an insignia that would become the famous New York Yankees "NY" logo was struck on a medal of honor by Tiffany & Co. and issued to the first NYC police officer shot in the line of duty. The Yankees adopted the logo in 1909. ) that would be the team logo long after the team became known as the Yankees, and would continue to be the cap insignia until today.