contamination danger graphic green illustration logo pollution radiation radioactive shape sign splatter symbol toxic warning advice alcohol alert announcement appropriate-behavior appropriate-behaviour banned be-careful beware black care careful caution communicating communication concern conditions consumption dangerous directions informing listen Look looking lookout no-alcohol no-swimming not-allowed not-permitted prohibited prohibition red risk risks safety signs warning-sign water white area children observance observant road school schools slow slow-down slower speed time times watch watch-out zone electricity power security symbolic voltage volts wording access-denied boating boats directing direction helpful information informative restricted restriction restrictions risky rocks rocky shallow symbols waterside words yellow barrel cannon comic comical concept conceptual condom contraception contraceptive disease free health healthcare healthy humor humorous humour humourous image intercourse isolated isolation latex medical message metaphor metaphorical object photo photograph picture prevent preventive protection protective resource safe sex sexuality std stock symbolism symbolize warn weapon atomic background bomb burst circle death design destruction energy fallout gray grey grunge grungy hazard hazardous icon nuclear pattern pictogram pictograph ray rays round somadjinn starburst texture vintage waste worn flake lubricity snow triangle winter astronomy comet doom fast portent shooting space stars universe velocity drown info lake pond