danger sign

adventure alert area attention bevel black blue bonds bone business caution challenge change chemical chemistry cleaners cloud clouds cloudy conditions crime crossbones cruel danger dangerous dead death die doom evil fear filesharing frighten halloween hazard head high horror icon isolated kill law lookout martyr memorial metaphor murdered not notice obey orange out passed piracy pirate plate poison poisonous precaution risk road roadsign rule rules safety sign skeleton skull sky street technical threat toxic toxical toxin warez warning yellow zone