emergency fire flash flashing hazard light lights police policia siren strobe strobe light warn warning caution eye eye protection goggle goggles mechanic protection safe safety shop sign alert atomic background black bomb burst circle danger dangerous death design destruction energy fallout free graphic gray grey grunge grungy hazardous icon image nuclear pattern pictogram pictograph picture pollution power radiation radioactive ray rays round somadjinn starburst stock symbol texture vintage waste white worn yellow communicate communication emergency exit escape exit fire escape alarm alarma bell disaster fire alarm fuego Life Saver save security bilingual board cliff close close-up closeup english erosion fall falling french green information message object photo photograph post red resource signage signal slip slippery slipping trip tripping UP