Final answer:
A flag flown at half-staff symbolizes a period of mourning, paying tribute to important individuals who have passed away or commemorating tragic events.
Step-by-step explanation:
When a flag is positioned at half-staff, it means that a period of mourning is taking place. This is usually done to honor the death of a significant figure or the casualties of a tragic event. In the United States, for example, the President can order the flag to be flown at half-staff as a mark of respect to deceased leaders or important figures, or to recognize tragedies that have affected the nation. On occasion, governors of states or territories may also make the same proclamation to honor individuals or events on a local level. Flying a flag at half-staff serves as a symbol of remembrance and collective sorrow, unifying people in recognition of loss and respect.