☣️생물학적 위험Biohazard. Means biohazards, contamination and danger. Use it for hazard warnings and zombie-apocalypse jokes.
⚡고압 주의High voltage. Means electricity, lightning and sudden energy. Use it for storms, shocks and "electric" moments.
☢️방사능Radioactive. Means radiation, hazard and glowing danger. Use it for hazard warnings and "toxic" jokes.