The answer to the crossword is ALI, which stands for the boxer Muhammad Ali. Muhammad Ali was an American professional boxer and activist who is widely regarded as one of the most significant and celebrated sports figures of the 20th century. He was born in Louisville, Kentucky, and is the subject of a museum in the city. The Muhammad Ali Center is a multicultural center located in Louisville that celebrates the life and legacy of Muhammad Ali. It features interactive exhibits, educational programs, and special events that focus on the six core principles of Muhammad Ali: Confidence, Conviction, Dedication, Giving, Respect, and Spirituality.