halfstaff
Half-staff is a position for displaying a flag on a flagpole, used to signify mourning, tribute, or solemn respect. When a flag is flown at half-staff, it is lowered from the full-staff height to a point roughly halfway up the pole. The term is most common in American English as “half-staff”; in British usage the equivalent term is “half-mast.” The concept may be described in different ways in various countries, but the underlying idea is a reduced, respectful display.
Flags are flown at half-staff by official order or ceremonial practice during periods of national mourning,
The practice has nautical origins, where lowering a flag on a ship indicated mourning. From there it