What does the number 15 represents about the time of Lincoln death?

The number 15 refers to April 15, 1865, the date of President Abraham Lincoln's assassination. He was shot by John Wilkes Booth at Ford's Theatre in Washington, D.C., and died the following morning. This date marks a pivotal moment in American history, as Lincoln was a key figure in the nation's Civil War and efforts to abolish slavery. His death significantly impacted the country's post-war reconstruction and political landscape.