👌OK-ZeichenAn OK hand. Conveys "okay", approval — but in some cultures it can be an offensive gesture, so context matters.
🔞Minderjährige verbotenNo one under eighteen. Means 18+ content and age limits. Use it for age-restricted warnings.
☣️BiogefährdungBiohazard. Means biohazards, contamination and danger. Use it for hazard warnings and zombie-apocalypse jokes.