firecracker
A small explosive firework that produces a loud bang. The term 南京 (Nanking) historically referred to things of Chinese origin, and 花火 means fireworks.
We set off firecrackers at the festival.
The sound of firecrackers can be heard from afar.
爆竹 is the more common modern word for firecracker. 南京花火 is an older or more specific term, often implying a Chinese-style firecracker.
花火 is the general term for fireworks, including aerial displays. 南京花火 specifically refers to firecrackers.
Compound of 南京 (Nanking, referring to China) and 花火 (fireworks). The term reflects the historical association of firecrackers with Chinese culture.