A biological hazard or biohazard is an organism, or substance derived from an organism, that poses a threat to human health. This can include medical waste or samples of a microorganism, virus or toxin that can impact human health. It can also include substances harmful to animals. The term and its associated symbol is generally used as a warning, so that those potentially exposed to the substances will know to take precautions. In Unicode, the biohazard sign is U+2623

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