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Safety signs are a type of sign designed to warn of hazards, indicate mandatory actions or required use of Personal protective equipment, prohibit actions or objects, identify the location of firefighting or safety equipment, or marking of exit routes.Under one classification system, there are three types of warning labels or decals:DANGER means if the danger is not avoided, it will cause death or serious injury. WARNING means if the warning is not heeded, it can cause death or serious injury. CAUTION means if the precaution is not taken, it may cause minor or moderate injury.