Flags are flown at half-mast (or half-staff) as a symbol of respect, mourning, distress, or a salute. It is a traditional gesture to honor the memory of deceased individuals, particularly important figures, or to mark days of national mourning or significant tragic events. The flag is lowered to a position below the top of the flagpole to signify this somber occasion. The tradition is believed to have originated in the 17th century, with some sources suggesting the lowered flag makes room for an "invisible flag of death" flying above. Protocol often involves first hoisting the flag to the top of the pole and then lowering it to the half-mast position, and raising it back to the top before lowering it at the end of the day.