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Signal words: a single word used to indicate the relative level of severity of hazard and alert the reader to a potential hazard on the label. The signal words used are danger and warning.. Danger is used for the more severe hazards, while warning is used for less severe hazards.
Learn about hazard and caution signs you may see at UC San Diego and what they mean. Hazard and caution signs identify facilities where work involves hazardous chemicals, infectious biological agents, radioactive materials, or equipment such as lasers, high voltage systems, or powerful magnets.