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Which sign shape is internationally used to signal a hazard in health and safety contexts?

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Multiple choice — select the best answer
✓ Correct answer: A. Warning triangle A triangular warning sign is the globally recognised symbol used to alert people to the presence of a hazard. Why the other options are incorrect: • Green circle: A green circle denotes a safe condition or permitted action, not a hazard. • Blue square: A blue square conveys mandatory information or instructions rather than a hazard warning. • Red circle: A red circle is used for prohibition signs, indicating something must not be done. • Yellow rectangle: A yellow rectangle may carry cautionary messages but is not the standard hazard sign shape.

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