Which signal word indicates a relatively non-toxic substance?

The signal word that indicates a relatively non-toxic substance is one that typically suggests minimal risk to health or the environment. In this context, "Caution or no signal" is appropriate because it implies that the substance is less hazardous compared to others that carry stronger warnings.

In pesticide labeling, "Caution" is often used for products that are slightly hazardous but still require recognition of potential risks. The absence of a signal word or the term "Caution" indicates that the product does not pose significant toxicity, framing it as relatively safe for handling and use around humans and animals, provided standard precautions are followed.

Other signal words convey higher levels of toxicity. For example, "Danger" explicitly indicates that the substance is highly toxic and can pose immediate risks. "Warning" represents chemicals that are moderately toxic, suggesting a greater risk than "Caution," but not as severe as "Danger." Therefore, when assessing risk levels, "Caution or no signal" effectively communicates a lower risk profile for the substance in question.