达姆达姆弹/ 達姆達姆彈 dámǔdámǔdàn dumdum bullet
An expanding bullet designed to mushroom upon impact, causing severe damage; developed at the Dum Dum Arsenal in India in the late 19th century and now banned by international convention. Also known as 达姆弹 dámǔdàn or 开花弹 kāihuādàn.