Final answer:
The blue diamond on a hazard identification system label signifies health hazards.
Explanation:
The blue diamond on a hazard identification system label indicates health hazards. It is part of the National Fire Protection Agency (NFPA) 704 Hazard Identification System, where different colored diamonds represent various types of hazards. The blue diamond specifically highlights the level of health hazard associated with a substance, ranging from 0 (no hazard) to 4 (extremely hazardous).
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