abbreviation for 'gunshot residue': microscopic particles (including burnt and unburnt primer, metal, and propellant particles) produced when a firearm is discharged, often analyzed in forensic investigations.

銃の発射時に生じる微粒子（燃焼・未燃焼の起爆薬、金属、火薬残留物など）を指す略語。鑑識で分析される