Beehive anti-personnel round
"Beehive" is named for the 'buzzing' sound its darts made when flying through the air. The first example was the M546 anti-personnel tracer (APERS-T), first fired in combat in 1966 and thereafter used extensively in the Vietnam War. Intended for direct fire against enemy troops, the M546 was direct fired from a near horizontally leveled 105 mm howitzer and ejected 8000 flechettes during flight by a mechanical time fuze.
Subsequently, it was reported that the USSR had developed similar rounds for 122 mm and 152 mm artillery for use in indirect fire.