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One of the famous yellow warning signs: explosion danger. Note that there are several signs with explosions - there's also "explosive atmosphere" and "explosion risk/explosive materials/compressed gas"... hazard warning sign Hazard Warning Sign: Explosion
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symbol fire flame hazard flammable logo xtremely burn extremely flamable Extremely Flammable clip art extremely flammable risk Extremely Flammable clip art
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Just another Warning sigh with exclamation mark. I made it symmetric with some gradient. The file in wiki (http://commons.wikimedia.org/wiki/File:Warning.svg) is not so symmetric. hazard warning sign warning Warning Sign
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