flechette
Noun
Meaning
A small sharp antipersonnel projectile, used as shrapnel, fired from a shotgun, or scattered from an aircraft.
(dated, uncountable) The game of lawn darts.
Source: en.wiktionary.orgExamples
In the late 1950s, the Special Purpose Individual Weapon program sought to create flechette rounds to allow troops to fire sabot -type projectiles to give a short flight time and flat trajectory with a muzzle velocity of convert to convert.
The flechette provide greatly extended range due to their aerodynamic shape, and improved penetration of light armor.
While the flechette ammo had excellent armor penetration, there were doubts about their terminal effectiveness against unprotected targets.